Add new diagnostics events for diagnostics

[tonidero]

Description

This will add a couple extra events to diagnostics to better debug any diagnostics issues if needed in the future:

• MAX_DIAGNOSTICS_SYNC_RETRIES_REACHED
• CLEARING_DIAGNOSTICS_AFTER_FAILED_SYNC

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 33.33333% with 8 lines in your changes missing coverage. Please review.

Project coverage is 83.29%. Comparing base (ffe071f) to head (5fc0c02). Report is 115 commits behind head on main.

Files with missing lines	Patch %	Lines
...purchases/common/diagnostics/DiagnosticsTracker.kt	0.00%	8 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1684 +/- ## ========================================== - Coverage 83.37% 83.29% -0.08% ========================================== Files 220 220 Lines 7511 7523 +12 Branches 1059 1059 ========================================== + Hits 6262 6266 +4 - Misses 831 839 +8 Partials 418 418 ```

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