Reset frames tracker on activity started

[adinauer]

📜 Description

💡 Motivation and Context

Also apply #2269 to 6.4.x so we can release 6.4.3 and users don't have to upgrade to a beta to get the fix or wait for 6.5 to be released.

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

🔮 Next steps

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	316.37 ms	360.71 ms	44.35 ms
Size	1.74 MiB	2.33 MiB	605.07 KiB

Previous results on branch: fix/6_4_fix_frames_tracking

Startup times

Revision	Plain	With Sentry	Diff
e33f950	316.35 ms	353.00 ms	36.65 ms

App size

Revision	Plain	With Sentry	Diff
e33f950	1.74 MiB	2.33 MiB	605.07 KiB

[adinauer]

Closed in favor of #2271