Move fragment auto span finish to onFragmentStarted

[stefanosiano]

📜 Description

moved fragment auto span finish to onFragmentStarted instead of onFragmentResumed to account for ViewPager2 behaviour

Other options considered, but failed:

• getUserVisibleHint(): it's deprecated and returns true for all fragments
• mMaxState: only accessible through reflection and returns the current max state achieved (in onFragmentStarted it will be STARTED, while in onFragmentResumed it will be RESUMED
• isVisible: returns true for all fragments

💡 Motivation and Context

Fixes #3269

💚 How did you test it?

Unit tests

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	399.94 ms	470.35 ms	70.41 ms
Size	1.70 MiB	2.28 MiB	592.08 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
d6d2b2e	413.20 ms	486.76 ms	73.56 ms
baaf637	418.39 ms	496.86 ms	78.47 ms
bf82eb3	423.76 ms	506.45 ms	82.69 ms
5e04ee8	370.06 ms	442.52 ms	72.46 ms
c34791a	415.40 ms	498.22 ms	82.82 ms
baaf637	401.69 ms	428.12 ms	26.43 ms
99a51e2	405.11 ms	479.65 ms	74.54 ms
3d8bd2b	364.76 ms	469.98 ms	105.22 ms
4e29063	384.14 ms	447.74 ms	63.60 ms
2fad834	390.07 ms	470.80 ms	80.73 ms

App size

Revision	Plain	With Sentry	Diff
d6d2b2e	1.72 MiB	2.27 MiB	555.05 KiB
baaf637	1.72 MiB	2.27 MiB	558.42 KiB
bf82eb3	1.70 MiB	2.28 MiB	587.99 KiB
5e04ee8	1.70 MiB	2.27 MiB	584.64 KiB
c34791a	1.70 MiB	2.28 MiB	587.88 KiB
baaf637	1.72 MiB	2.27 MiB	558.42 KiB
99a51e2	1.72 MiB	2.29 MiB	576.34 KiB
3d8bd2b	1.72 MiB	2.29 MiB	577.53 KiB
4e29063	1.72 MiB	2.29 MiB	578.38 KiB
2fad834	1.72 MiB	2.29 MiB	577.53 KiB