feat: use distinct span operations for app start phases

[itaybre]

Description

Standalone app start child spans now use specific operation names instead of the generic app.start operation. This improves observability and allows filtering by individual app start phases.

Operation mapping (standalone spans only)

Span description	Before	After
Pre Runtime Init	app.start	app.start.pre_runtime_init
Runtime Init to Pre Main Initializers	app.start	app.start.runtime_init
UIKit Init	app.start	app.start.uikit_init
Application Init	app.start	app.start.application_init
Extended App Start	app.start	app.start.extended_app_start

Spotlight confirmation of the rename

Non-standalone spans retain their existing app.start operation unchanged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.406%. Comparing base (72ea638) to head (b8a8779).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #8003       +/-   ##
=============================================
+ Coverage   87.308%   87.406%   +0.097%     
=============================================
  Files          553       553               
  Lines        31967     31976        +9     
  Branches     13151     13161       +10     
=============================================
+ Hits         27910     27949       +39     
+ Misses        4009      3980       -29     
+ Partials        48        47        -1     

Files with missing lines	Coverage Δ
Sources/Sentry/SentryBuildAppStartSpans.m	100.000% <100.000%> (ø)
...StartTracking/SentryExtendedAppLaunchManager.swift	95.238% <100.000%> (ø)

... and 5 files with indirect coverage changes

---

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[sentry]

📲 Install Builds

iOS

🔗 App Name	App ID	Version	Configuration
SDK-Size	io.sentry.sample.SDK-Size	9.16.1 (1)	Release

⚙️ sentry-cocoa Build Distribution Settings

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1211.56 ms	1249.20 ms	37.64 ms
Size	24.14 KiB	1.18 MiB	1.15 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
962c7bc	1235.49 ms	1262.79 ms	27.30 ms
9da166b	1222.40 ms	1250.24 ms	27.84 ms
39655d1	1224.05 ms	1258.38 ms	34.33 ms
31a83fd	1218.63 ms	1247.18 ms	28.55 ms
1770336	1225.09 ms	1251.32 ms	26.23 ms
8d75f5a	1223.90 ms	1255.94 ms	32.04 ms
943b250	1214.69 ms	1257.32 ms	42.63 ms
6feb25a	1233.71 ms	1261.45 ms	27.73 ms
e44b6f8	1225.98 ms	1249.20 ms	23.23 ms
ddbec00	1229.12 ms	1261.33 ms	32.20 ms

App size

Revision	Plain	With Sentry	Diff
962c7bc	24.14 KiB	1.16 MiB	1.13 MiB
9da166b	24.14 KiB	1.16 MiB	1.14 MiB
39655d1	24.14 KiB	1.16 MiB	1.14 MiB
31a83fd	24.14 KiB	1.17 MiB	1.15 MiB
1770336	24.14 KiB	1.15 MiB	1.13 MiB
8d75f5a	24.14 KiB	1.17 MiB	1.15 MiB
943b250	24.14 KiB	1.17 MiB	1.15 MiB
6feb25a	24.14 KiB	1.17 MiB	1.14 MiB
e44b6f8	24.14 KiB	1.15 MiB	1.13 MiB
ddbec00	24.14 KiB	1.17 MiB	1.15 MiB

Previous results on branch: itay/update_spans_operations

Startup times

Revision	Plain	With Sentry	Diff
d4a8c2a	1212.39 ms	1246.71 ms	34.33 ms
3379181	1233.89 ms	1254.81 ms	20.92 ms
8bc0f14	1218.65 ms	1253.47 ms	34.82 ms

App size

Revision	Plain	With Sentry	Diff
d4a8c2a	24.14 KiB	1.17 MiB	1.15 MiB
3379181	24.14 KiB	1.17 MiB	1.15 MiB
8bc0f14	24.14 KiB	1.17 MiB	1.15 MiB

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against b8a8779

[philprime]

LGTM