chore: Convert SentryAutoSessionTrackingIntegration to Swift

[itaybre]

Converts SentryAutoSessionTrackingIntegration to Swift in preparation for some fixes for System Extensions (see this issue)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.120%. Comparing base (3c70f95) to head (25d4906).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #6961       +/-   ##
=============================================
+ Coverage   85.043%   85.120%   +0.076%     
=============================================
  Files          453       453               
  Lines        27681     27683        +2     
  Branches     12166     12165        -1     
=============================================
+ Hits         23541     23564       +23     
+ Misses        4094      4076       -18     
+ Partials        46        43        -3     

Files with missing lines	Coverage Δ
Sources/Sentry/SentryBaseIntegration.m	97.368% <ø> (+1.605%)	⬆️
Sources/Sentry/SentrySDKInternal.m	85.080% <100.000%> (ø)
Sources/Swift/Core/Integrations/Integrations.swift	100.000% <100.000%> (ø)
...Session/SentryAutoSessionTrackingIntegration.swift	100.000% <100.000%> (ø)
Sources/Swift/SentryDependencyContainer.swift	98.496% <ø> (ø)

... and 7 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1221.84 ms	1255.78 ms	33.94 ms
Size	24.14 KiB	1.02 MiB	1017.04 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
83e9b16	1223.25 ms	1250.94 ms	27.69 ms
8745cc0	1228.13 ms	1250.48 ms	22.35 ms
abafa5d	1228.91 ms	1257.11 ms	28.20 ms
39e3732	1193.96 ms	1219.51 ms	25.55 ms
ea5a59b	1222.87 ms	1253.47 ms	30.60 ms
e5773c1	1235.10 ms	1264.15 ms	29.04 ms
2609f7a	1218.17 ms	1241.34 ms	23.17 ms
827b50c	1233.27 ms	1267.28 ms	34.01 ms
daf8077	1202.78 ms	1235.52 ms	32.74 ms
1ed7bf6	1215.78 ms	1255.78 ms	40.00 ms

App size

Revision	Plain	With Sentry	Diff
83e9b16	23.75 KiB	947.72 KiB	923.97 KiB
8745cc0	23.74 KiB	971.81 KiB	948.07 KiB
abafa5d	23.74 KiB	1023.00 KiB	999.25 KiB
39e3732	24.15 KiB	1.01 MiB	1014.59 KiB
ea5a59b	23.75 KiB	874.46 KiB	850.71 KiB
e5773c1	23.75 KiB	1.00 MiB	1005.08 KiB
2609f7a	23.75 KiB	867.04 KiB	843.29 KiB
827b50c	23.75 KiB	1.00 MiB	1005.07 KiB
daf8077	23.75 KiB	971.82 KiB	948.07 KiB
1ed7bf6	24.14 KiB	1.01 MiB	1012.91 KiB

Previous results on branch: itay/convert_autosessionintegration_to_swift

Startup times

Revision	Plain	With Sentry	Diff
c130777	1222.88 ms	1255.96 ms	33.08 ms

App size

Revision	Plain	With Sentry	Diff
c130777	24.14 KiB	1.02 MiB	1017.04 KiB

[cursor]

Bug: Test crashes due to nil integration with disabled tracking

The test sets options.enableAutoSessionTracking = false to prevent automatic SDK installation, then manually creates SentryAutoSessionTrackingIntegration. However, the new Swift implementation's failable initializer returns nil when enableAutoSessionTracking is false. Since autoSessionTrackingIntegration is declared as an implicitly unwrapped optional (!), subsequent calls to .stop() in tearDown() and throughout the test will crash due to force-unwrapping nil.

Additional Locations (2)

• Tests/SentryTests/Integrations/Session/SentrySessionGeneratorTests.swift#L35-L36
• Tests/SentryTests/Integrations/Session/SentrySessionGeneratorTests.swift#L56-L57