fix(django): patch components on import [backport #5455 to 1.12] (#5773)

Backport of #5455 to 1.12

This change ensures that the Django integration patches the relevant
methods and functions only when the containing modules are imported,
instead of force-loading them and causing potential side effects.

Fixes #5453. 

## Testing strategy

An additional test case targeting celery with gevent worker classes is
added to validate that we don't import from `django` when initialising
the library

## Risks

The change is equivalent to the original coding feature-wise. The only
difference is the removal of potential side-effects from the forced
imports. It is unlikely that users relied on those.

## Checklist

- [x] Change(s) are motivated and described in the PR description.
- [x] Testing strategy is described if automated tests are not included
in the PR.
- [x] Risk is outlined (performance impact, potential for breakage,
maintainability, etc).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] [Library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/contributing.html#Release-Note-Guidelines)
are followed.
- [x] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/)).
- [x] PR description includes explicit acknowledgement/acceptance of the
performance implications of this PR as reported in the benchmarks PR
comment.

## Reviewer Checklist

- [x] Title is accurate.
- [x] No unnecessary changes are introduced.
- [x] Description motivates each change.
- [x] Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes unless absolutely necessary.
- [x] Testing strategy adequately addresses listed risk(s).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] Release note makes sense to a user of the library.
- [x] Reviewer has explicitly acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment.

Author: P403n1x87

.circleci/config.yml

@@ -565,7 +565,7 @@ jobs:
     parallelism: 2
     steps:
       - run_test:
-          pattern: 'django$'
+          pattern: 'django($|_celery)'
           snapshot: true
           docker_services: "memcached redis postgres"
 

.riot/requirements/19ba70f.txt

@@ -0,0 +1,48 @@
+#
+# This file is autogenerated by pip-compile with Python 3.10
+# by the following command:
+#
+#    pip-compile --no-annotate --resolver=backtracking .riot/requirements/19ba70f.in
+#
+amqp==5.1.1
+attrs==23.1.0
+billiard==3.6.4.0
+celery==5.0.5
+certifi==2022.12.7
+charset-normalizer==3.1.0
+click==7.1.2
+click-didyoumean==0.3.0
+click-plugins==1.1.1
+click-repl==0.2.0
+coverage[toml]==7.2.5
+django==2.2.1
+exceptiongroup==1.1.1
+gevent==22.10.2
+greenlet==2.0.2
+hypothesis==6.45.0
+idna==3.4
+iniconfig==2.0.0
+kombu==5.2.4
+mock==5.0.2
+opentracing==2.4.0
+packaging==23.1
+pluggy==1.0.0
+prompt-toolkit==3.0.38
+pytest==7.3.1
+pytest-cov==4.0.0
+pytest-mock==3.10.0
+pytz==2023.3
+requests==2.29.0
+six==1.16.0
+sortedcontainers==2.4.0
+sqlalchemy==1.2.19
+sqlparse==0.4.4
+tomli==2.0.1
+urllib3==1.26.15
+vine==5.0.0
+wcwidth==0.2.6
+zope-event==4.6
+zope-interface==6.0
+
+# The following packages are considered to be unsafe in a requirements file:
+# setuptools

.riot/requirements/1a16fc1.txt

@@ -0,0 +1,48 @@
+#
+# This file is autogenerated by pip-compile with Python 3.9
+# by the following command:
+#
+#    pip-compile --no-annotate --resolver=backtracking .riot/requirements/1a16fc1.in
+#
+amqp==5.1.1
+attrs==23.1.0
+billiard==3.6.4.0
+celery==5.0.5
+certifi==2022.12.7
+charset-normalizer==3.1.0
+click==7.1.2
+click-didyoumean==0.3.0
+click-plugins==1.1.1
+click-repl==0.2.0
+coverage[toml]==7.2.5
+django==2.2.1
+exceptiongroup==1.1.1
+gevent==22.10.2
+greenlet==2.0.2
+hypothesis==6.45.0
+idna==3.4
+iniconfig==2.0.0
+kombu==5.2.4
+mock==5.0.2
+opentracing==2.4.0
+packaging==23.1
+pluggy==1.0.0
+prompt-toolkit==3.0.38
+pytest==7.3.1
+pytest-cov==4.0.0
+pytest-mock==3.10.0
+pytz==2023.3
+requests==2.29.0
+six==1.16.0
+sortedcontainers==2.4.0
+sqlalchemy==1.2.19
+sqlparse==0.4.4
+tomli==2.0.1
+urllib3==1.26.15
+vine==5.0.0
+wcwidth==0.2.6
+zope-event==4.6
+zope-interface==6.0
+
+# The following packages are considered to be unsafe in a requirements file:
+# setuptools

.riot/requirements/1c6d4cc.txt

@@ -0,0 +1,48 @@
+#
+# This file is autogenerated by pip-compile with Python 3.8
+# by the following command:
+#
+#    pip-compile --no-annotate --resolver=backtracking .riot/requirements/1c6d4cc.in
+#
+amqp==5.1.1
+attrs==23.1.0
+billiard==3.6.4.0
+celery==5.0.5
+certifi==2022.12.7
+charset-normalizer==3.1.0
+click==7.1.2
+click-didyoumean==0.3.0
+click-plugins==1.1.1
+click-repl==0.2.0
+coverage[toml]==7.2.5
+django==2.2.1
+exceptiongroup==1.1.1
+gevent==22.10.2
+greenlet==2.0.2
+hypothesis==6.45.0
+idna==3.4
+iniconfig==2.0.0
+kombu==5.2.4
+mock==5.0.2
+opentracing==2.4.0
+packaging==23.1
+pluggy==1.0.0
+prompt-toolkit==3.0.38
+pytest==7.3.1
+pytest-cov==4.0.0
+pytest-mock==3.10.0
+pytz==2023.3
+requests==2.29.0
+six==1.16.0
+sortedcontainers==2.4.0
+sqlalchemy==1.2.19
+sqlparse==0.4.4
+tomli==2.0.1
+urllib3==1.26.15
+vine==5.0.0
+wcwidth==0.2.6
+zope-event==4.6
+zope-interface==6.0
+
+# The following packages are considered to be unsafe in a requirements file:
+# setuptools

.riot/requirements/4a79f8d.txt

@@ -0,0 +1,46 @@
+#
+# This file is autogenerated by pip-compile with Python 3.11
+# by the following command:
+#
+#    pip-compile --no-annotate --resolver=backtracking .riot/requirements/4a79f8d.in
+#
+amqp==5.1.1
+attrs==23.1.0
+billiard==3.6.4.0
+celery==5.0.5
+certifi==2022.12.7
+charset-normalizer==3.1.0
+click==7.1.2
+click-didyoumean==0.3.0
+click-plugins==1.1.1
+click-repl==0.2.0
+coverage[toml]==7.2.5
+django==2.2.1
+gevent==22.10.2
+greenlet==2.0.2
+hypothesis==6.45.0
+idna==3.4
+iniconfig==2.0.0
+kombu==5.2.4
+mock==5.0.2
+opentracing==2.4.0
+packaging==23.1
+pluggy==1.0.0
+prompt-toolkit==3.0.38
+pytest==7.3.1
+pytest-cov==4.0.0
+pytest-mock==3.10.0
+pytz==2023.3
+requests==2.29.0
+six==1.16.0
+sortedcontainers==2.4.0
+sqlalchemy==1.2.19
+sqlparse==0.4.4
+urllib3==1.26.15
+vine==5.0.0
+wcwidth==0.2.6
+zope-event==4.6
+zope-interface==6.0
+
+# The following packages are considered to be unsafe in a requirements file:
+# setuptools