No longer use String.join in Baggage as it requires API level 26

[adinauer]

📜 Description

No longer use String.join in Baggage as it requires API level 26

💡 Motivation and Context

Fixes #2774

💚 How did you test it?

Unit Tests

📝 Checklist

• 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

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	321.66 ms	357.88 ms	36.22 ms
Size	1.72 MiB	2.28 MiB	571.64 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
46b1782	387.72 ms	458.74 ms	71.02 ms
16cd2b6	243.02 ms	349.69 ms	106.67 ms
cb6c658	327.57 ms	383.38 ms	55.80 ms
ff49977	325.84 ms	365.67 ms	39.83 ms
cb6c658	311.33 ms	355.09 ms	43.76 ms
1707044	338.80 ms	384.79 ms	46.00 ms

App size

Revision	Plain	With Sentry	Diff
46b1782	1.72 MiB	2.28 MiB	570.44 KiB
16cd2b6	1.72 MiB	2.28 MiB	570.95 KiB
cb6c658	1.72 MiB	2.28 MiB	571.59 KiB
ff49977	1.72 MiB	2.28 MiB	571.59 KiB
cb6c658	1.72 MiB	2.28 MiB	571.59 KiB
1707044	1.72 MiB	2.28 MiB	570.44 KiB

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (afecabf) 81.10% compared to head (96230fc) 81.11%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2778      +/-   ##
============================================
+ Coverage     81.10%   81.11%   +0.01%     
- Complexity     4476     4479       +3     
============================================
  Files           347      347              
  Lines         16499    16510      +11     
  Branches       2236     2238       +2     
============================================
+ Hits          13381    13392      +11     
  Misses         2183     2183              
  Partials        935      935              

Impacted Files	Coverage Δ
sentry/src/main/java/io/sentry/Baggage.java	86.62% <100.00%> (+0.23%)	⬆️
...ntry/src/main/java/io/sentry/util/StringUtils.java	87.75% <100.00%> (+2.38%)	⬆️

☔ View full report in Codecov by Sentry.
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[marandaneto]

@romtsn @kahest can you prioritize #1403 ? this keeps happening so it should not be p2.
If this does not solve the issue because linting goes thru and the build also passes, we can run our tests on the min API, using RobolectricTestRunner and emulateSdk at least.

[kahest]

@marandaneto makes sense, we'll discuss in sync