fix: Accessing UI API on bg thread in enrichScope

[philipphofmann]

📜 Description

Fix accessing UIDevice in enrich scope, which could be called on a background thread by caching the system version in the SentryUIDeviceWrapper.

💡 Motivation and Context

Came up in #3836 (comment) and while investigating flaky tests.

💚 How did you test it?

Unit tests.

📝 Checklist

You have to check all boxes before merging:

• 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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.492%. Comparing base (65e8a5b) to head (2f93364).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4245       +/-   ##
=============================================
- Coverage   91.495%   91.492%   -0.003%     
=============================================
  Files          612       612               
  Lines        49455     49475       +20     
  Branches     17899     17903        +4     
=============================================
+ Hits         45249     45266       +17     
- Misses        4113      4117        +4     
+ Partials        93        92        -1     

Files	Coverage Δ
Sources/Sentry/SentryCrashWrapper.m	94.594% <100.000%> (+0.074%)	⬆️
Sources/Sentry/SentryDependencyContainer.m	95.918% <ø> (-0.028%)	⬇️
Sources/Sentry/SentrySDK.m	88.826% <100.000%> (ø)
Sources/Sentry/SentryUIDeviceWrapper.m	92.857% <100.000%> (+1.948%)	⬆️
...ions/SentryCrash/SentryCrashIntegrationTests.swift	85.087% <100.000%> (+0.198%)	⬆️
Tests/SentryTests/SentrySDKTests.swift	96.762% <100.000%> (+1.349%)	⬆️

... and 7 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1231.64 ms	1251.91 ms	20.27 ms
Size	21.58 KiB	699.39 KiB	677.80 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
e8c8a05	1218.71 ms	1234.50 ms	15.79 ms
1ce939e	1222.22 ms	1243.26 ms	21.04 ms
6d541bc	1223.06 ms	1242.38 ms	19.32 ms
ceb2092	1205.27 ms	1221.44 ms	16.17 ms
2f8b3a8	1233.76 ms	1260.24 ms	26.48 ms
db533ee	1228.96 ms	1248.23 ms	19.28 ms
728804f	1235.26 ms	1254.20 ms	18.94 ms
034be1c	1222.67 ms	1236.22 ms	13.55 ms
2affdbd	1224.29 ms	1248.06 ms	23.77 ms
6a6a5b2	1243.67 ms	1252.51 ms	8.84 ms

App size

Revision	Plain	With Sentry	Diff
e8c8a05	21.58 KiB	683.51 KiB	661.92 KiB
1ce939e	22.85 KiB	412.98 KiB	390.13 KiB
6d541bc	21.58 KiB	616.71 KiB	595.13 KiB
ceb2092	21.58 KiB	670.39 KiB	648.81 KiB
2f8b3a8	20.76 KiB	434.72 KiB	413.96 KiB
db533ee	21.58 KiB	547.02 KiB	525.44 KiB
728804f	22.85 KiB	411.76 KiB	388.91 KiB
034be1c	20.76 KiB	436.66 KiB	415.90 KiB
2affdbd	22.85 KiB	411.37 KiB	388.52 KiB
6a6a5b2	21.58 KiB	698.12 KiB	676.54 KiB

Previous results on branch: fix/ui-api-bg-thread-enrich-scope

Startup times

Revision	Plain	With Sentry	Diff
b44935c	1218.29 ms	1230.31 ms	12.03 ms

App size

Revision	Plain	With Sentry	Diff
b44935c	21.58 KiB	698.30 KiB	676.72 KiB