Fix tests failing if run with OPTA_DISABLE_REPORTING=1

[rabbitfang]

Description

If you run Python tests (i.e. make test) locally while OPTA_DISABLE_REPORTING=1 is set in your terminal, tests will fail because the datadog and amplitude tests rely on that env var not being set when the test is run, but they do not validate that assumption. This PR adds a pytest fixture that makes it easy to handle that case.

The hide_debug_mode fixture unsets configured env vars (currently, only OPTA_DISABLE_REPORTING) as well as sys._called_from_test during the test and restores the original values after the test. It is defined in tests/conftest.py to make it available to any test under tests/.

This PR also removes # noqa lines from the amplitude and datadog test files as part of cleanup.

Safety checklist

• This change is backwards compatible and safe to apply by existing users
• This change will NOT lead to data loss
• This change will NOT lead to downtime who already has an env/service setup

How has this change been tested, beside unit tests?

This change only affects unit tests.

[codecov]

Codecov Report

Merging #831 (75b352c) into main (34b747c) will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #831      +/-   ##
==========================================
+ Coverage   73.89%   74.06%   +0.17%     
==========================================
  Files         117      119       +2     
  Lines        7761     7821      +60     
==========================================
+ Hits         5735     5793      +58     
- Misses       2026     2028       +2     

Flag	Coverage Δ
unittests	74.06% <ø> (+0.17%)	⬆️

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Impacted Files	Coverage Δ
opta/layer.py	82.71% <0.00%> (ø)
modules/tests/test_aws_base.py	100.00% <0.00%> (ø)
modules/aws_base/aws_base.py	90.90% <0.00%> (ø)

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