fix: Handle no releaseName in WatchdogLogic

[philipphofmann]

📜 Description

The release name passed to the app state from the options is nullable. The SentryAppState including the SentryWatchdogTerminationLogic couldn't handle this edge case correctly, which is fixed now.

💡 Motivation and Context

Unit tests started to fail suddenly on the main branch https://github.com/getsentry/sentry-cocoa/actions/runs/8879401702/job/24377229574.

💚 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 90.694%. Comparing base (aa45f36) to head (4305a9a).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3919       +/-   ##
=============================================
+ Coverage   90.690%   90.694%   +0.003%     
=============================================
  Files          581       582        +1     
  Lines        45418     45520      +102     
  Branches     16162     16221       +59     
=============================================
+ Hits         41190     41284       +94     
- Misses        4048      4166      +118     
+ Partials       180        70      -110     

Files	Coverage Δ
Sources/Sentry/SentryAppState.m	98.648% <100.000%> (+0.018%)	⬆️
Sources/Sentry/SentryWatchdogTerminationLogic.m	78.378% <100.000%> (+6.156%)	⬆️
Tests/SentryTests/Helper/SentryAppStateTests.swift	100.000% <100.000%> (ø)
...s/SentryWatchdogTerminationsIntegrationTests.swift	96.923% <100.000%> (-0.047%)	⬇️
...tions/SentryWatchdogTerminationsTrackerTests.swift	100.000% <100.000%> (+1.310%)	⬆️

... and 44 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1212.77 ms	1237.29 ms	24.52 ms
Size	21.58 KiB	616.79 KiB	595.21 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
408f43e	1210.44 ms	1242.35 ms	31.91 ms
07b120c	1227.48 ms	1235.14 ms	7.66 ms
d9308fd	1228.04 ms	1243.35 ms	15.31 ms
60dd0f5	1238.98 ms	1254.48 ms	15.50 ms
51307b7	1223.08 ms	1240.76 ms	17.68 ms
ee3f02e	1236.53 ms	1263.54 ms	27.01 ms
eaa1002	1205.50 ms	1235.08 ms	29.58 ms
b9a9dca	1196.09 ms	1225.14 ms	29.05 ms
a6f8b18	1238.54 ms	1265.56 ms	27.02 ms
28c80b5	1198.63 ms	1214.08 ms	15.45 ms

App size

Revision	Plain	With Sentry	Diff
408f43e	21.58 KiB	573.17 KiB	551.59 KiB
07b120c	21.58 KiB	614.90 KiB	593.32 KiB
d9308fd	21.58 KiB	612.83 KiB	591.25 KiB
60dd0f5	20.76 KiB	393.37 KiB	372.61 KiB
51307b7	22.85 KiB	407.63 KiB	384.78 KiB
ee3f02e	22.84 KiB	401.67 KiB	378.83 KiB
eaa1002	20.76 KiB	423.19 KiB	402.43 KiB
b9a9dca	21.58 KiB	414.59 KiB	393.01 KiB
a6f8b18	20.76 KiB	431.87 KiB	411.11 KiB
28c80b5	21.58 KiB	417.85 KiB	396.27 KiB