[build-tools] Log Gradle cache restore events to Datadog

[AbbanMustafa]

Why

We want to track Gradle cache restore events in Datadog to gain visibility into time benefits across builds/users.

How

• Added a turtleFetch call in restoreGradleCacheAsync that sends a log to the new /turtle-builds/logs endpoint when Gradle cache is successfully restored
• Tags the log with build_id, cache_hit_type (direct hit vs prefix match), cache_key, and matched_key
• Updated service.ts to use the new /turtle-builds/logs route with level: 'error' (replaces /turtle-builds/error-logs)
• Updated corresponding tests

Test Plan

• Deploy the www route first so both /logs and /error-logs are available
• Deploy this change and verify Gradle cache restore logs appear in Datadog with correct build ID tags
• Clean up legacy /error-logs route in www after rollout

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@douglowder

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[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.51%. Comparing base (3318392) to head (cc41bee).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
...ild-tools/src/steps/functions/restoreBuildCache.ts	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3674      +/-   ##
==========================================
- Coverage   56.51%   56.51%   -0.00%     
==========================================
  Files         886      887       +1     
  Lines       38201    38416     +215     
  Branches     7950     8007      +57     
==========================================
+ Hits        21587    21707     +120     
- Misses      16516    16611      +95     
  Partials       98       98              

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[github-actions]

⏩ The changelog entry check has been skipped since the "no changelog" label is present.

[sjchmiela]

shouldn't this be a metric, not a log?

[AbbanMustafa]

i want to tag by build id 💸💸💸🤫