Make clearing diagnostics file happen during tracking

[tonidero]

Description

We were clearing the diagnostics file during SDK configuration if we detected the file to be too big. We could make this clearing happen during tracking of events. Advantages of this:

• We make sure the file never gets too big
• We don't miss extra events if we need to clear the file

This shouldn't be a problem performance-wise since we are doing all this in a background thread + checking the file size is pretty quick.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 74.28571% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 83.31%. Comparing base (22d7098) to head (46257e5).

:exclamation: Current head 46257e5 differs from pull request most recent head dd0ce31. Consider uploading reports for the commit dd0ce31 to get more accurate results

Files	Patch %	Lines
...otlin/com/revenuecat/purchases/PurchasesFactory.kt	20.00%	3 Missing and 1 partial :warning:
.../purchases/common/diagnostics/DiagnosticsHelper.kt	75.00%	3 Missing :warning:
...purchases/common/diagnostics/DiagnosticsTracker.kt	83.33%	1 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1685 +/- ## ========================================== + Coverage 83.27% 83.31% +0.04% ========================================== Files 220 221 +1 Lines 7539 7522 -17 Branches 1061 1059 -2 ========================================== - Hits 6278 6267 -11 + Misses 842 836 -6 Partials 419 419 ```

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[RevenueCat-Danger-Bot]

	1 Message
:book:	Size increase: 4.03 KB

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