Change log level from INFO to WARN for error message indicating a failed Log4j2 Sentry.init

[johnnywiller]

📜 Description

Changed INFO level logging to WARN when failing to initialise

💡 Motivation and Context

Normally log4j appenders are configured to show only warnings, and is also the example on the official page
https://docs.sentry.io/platforms/java/guides/log4j2/.

With that, if Sentry fails to initialise due to e.g missing DSN, the user has no useful feedback.

💚 How did you test it?

I didn't find necessary to add a test for the logging

📝 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

[adinauer]

Thanks @johnnywiller for fixing 🚀 ! I just added the changelog. I tested manually. Agree that this doesn't need an extra test.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (550d8ec) 81.30% compared to head (3bc0fc5) 81.30%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2606   +/-   ##
=========================================
  Coverage     81.30%   81.30%           
  Complexity     4186     4186           
=========================================
  Files           336      336           
  Lines         15484    15484           
  Branches       2022     2022           
=========================================
  Hits          12589    12589           
  Misses         2101     2101           
  Partials        794      794           

Impacted Files	Coverage Δ
...src/main/java/io/sentry/log4j2/SentryAppender.java	87.27% <0.00%> (ø)

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