Fix TestHooksInSourceFreshnessDisabled flaky test

[MichelleArk]

resolves #10309

Problem

TestHooksInSourceFreshnessDisabled passes when run via tests/functional/sources/test_source_freshness.py, but fails independently.

• More specifically, test always passes when run with TestSourceFreshnessProjectHooksNotRun, likely due to a shared global (deprecations).

pytest tests/functional/sources/test_source_freshness.py::TestSourceFreshnessProjectHooksNotRun tests/functional/sources/test_source_freshness.py::TestHooksInSourceFreshnessDisabled

Solution

• Safely cleanup deprecations in TestSourceFreshnessProjectHooksNotRun
• Make log matching more precise + consistent across the hook-related functional test assertions

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.70%. Comparing base (8639290) to head (0f478a0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10308      +/-   ##
==========================================
- Coverage   88.76%   88.70%   -0.06%     
==========================================
  Files         180      180              
  Lines       22483    22483              
==========================================
- Hits        19957    19944      -13     
- Misses       2526     2539      +13     

Flag	Coverage Δ
integration	86.00% <ø> (-0.11%)	⬇️
unit	61.78% <ø> (ø)

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[MichelleArk]

root cause: this clean-up call was missing from test_hooks_do_run_for_source_freshness initially, meaning the global active_deprecations was preserved across tests, triggering deprecations erronously (and cluttering up the logs)

[McKnight-42]

Oh that's interesting, updates look fine to me

[aranke]

LGTM!