fix: Add null-handling for static cache path in async logger

[philprime]

This PR is derived from #5572 in an effort to make the large amount of changes easier to review for #5577.

The async logger relies on a nullable static caches path, so we need to unwrap it before we check for existence. As we are already logging an error and exiting the method, when directory creation fails, I use the same approach when the cache directory is not defined.

#skip-changelog

[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
31993	2	31991	97

View the top 1 failed test(s) by shortest run time

iOS_SwiftUI_UITests.LaunchUITests::testNoNewTransactionForSecondCallToBody

Stack Traces | 0s run time

.../iOS-SwiftUI/iOS-SwiftUI-UITests/LaunchUITests.swift:38 - Failed to get matching snapshot: Timed out while evaluating UI query.

View the full list of 1 ❄️ flaky tests

iOS_SwiftUI_UITests.FeedbackUITests::testWidgetDisplayInSwiftUIApp

Flake rate in main: 13.64% (Passed 57 times, Failed 9 times)

Stack Traces | 0s run time

.../iOS-SwiftUI/iOS-SwiftUI-UITests/FeedbackUITests.swift:14 - Failed to get matching snapshots: Timed out while evaluating UI query.

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1214.82 ms	1246.94 ms	32.12 ms
Size	23.75 KiB	919.79 KiB	896.04 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
ebc72be	1221.24 ms	1249.66 ms	28.42 ms
dad68ad	1229.15 ms	1261.98 ms	32.83 ms
aa0b738	1236.78 ms	1253.08 ms	16.31 ms
186f06f	1211.33 ms	1235.41 ms	24.08 ms
9be5373	1215.92 ms	1239.44 ms	23.52 ms
64c2b2b	1233.96 ms	1260.20 ms	26.24 ms
15c8cd5	1220.24 ms	1246.14 ms	25.90 ms
b41e6a7	1201.65 ms	1246.12 ms	44.47 ms
018037b	1209.31 ms	1228.33 ms	19.03 ms
7908e84	1224.33 ms	1246.39 ms	22.06 ms

App size

Revision	Plain	With Sentry	Diff
ebc72be	23.75 KiB	908.22 KiB	884.47 KiB
dad68ad	23.75 KiB	912.37 KiB	888.63 KiB
aa0b738	23.74 KiB	872.75 KiB	849.00 KiB
186f06f	23.75 KiB	876.94 KiB	853.19 KiB
9be5373	23.75 KiB	866.50 KiB	842.75 KiB
64c2b2b	23.75 KiB	908.55 KiB	884.80 KiB
15c8cd5	23.75 KiB	908.01 KiB	884.26 KiB
b41e6a7	23.75 KiB	908.03 KiB	884.28 KiB
018037b	23.75 KiB	867.16 KiB	843.41 KiB
7908e84	23.74 KiB	872.75 KiB	849.00 KiB

[philipphofmann]

LGTM