docs: fix readthedocs build [backport 2.3] (#7719)

Backport 62db3a9 from #7700 to 2.3.

Resolves: #7606

Resolves circular imports by avoiding patching and tracing sphynx
imports.

Note - We do not have test coverage for generating docs. I verified this
change locally by running: `hatch -v run docs:sphinx-build -W -b html
docs docs/_build/html`

## 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/releasenotes.html)
are followed. If no release note is required, add label
`changelog/no-changelog`.
- [x] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/)).
- [x] Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## 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.
- [x] Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)
- [x] If this PR touches code that signs or publishes builds or
packages, or handles credentials of any kind, I've requested a review
from `@DataDog/security-design-and-guidance`.
- [x] This PR doesn't touch any of that.

Co-authored-by: Munir Abdinur <[email protected]>

Author: github-actions[bot]

hatch.toml

@@ -84,6 +84,8 @@ extra-dependencies = [
 pre-install-commands = [
     "scripts/docs/install.sh",
 ]
+[envs.docs.env-vars]
+DD_TRACE_ENABLED = "false"
 
 [envs.docs.scripts]
 build = [

scripts/docs/build.sh

@@ -1,7 +1,4 @@
 #!/usr/bin/env bash
-
-export DD_TRACE_ENABLED=0
-
 set -eux
 
 reno lint