chore(test): ignore commented lines in riot requirements (#6033)

Add an option in the diff script to ignore commented lines that can be
different due to different versions of pip-tools

## 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/)).

## 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: christophe-papazian

scripts/check-diff

@@ -2,10 +2,10 @@
 
 directory=${1:-"."}
 message=${2:-"Files were changed or added."}
-changed_files="$(git diff -- ${directory})"
+changed_files="$(git diff -I '^#' -- ${directory})"
 new_files="$(git ls-files -o --exclude-standard -- ${directory})"
 
-if [[ "$(git diff --exit-code -- ${directory})" || -n $new_files ]]
+if [[ "$(git diff -I '^#' --exit-code -- ${directory})" || -n $new_files ]]
 then
     echo "${changed_files}"
     echo "${new_files}"