fix(tls): log transient SSL factory renewal failures at WARN instead of INFO

[dkranchii]

Bumps the log level from INFO to WARN in the retry catch block of
RenewableTlsUtils.reloadSslFactory, so transient SSL renewal failures
are visible to anyone monitoring at WARN+ (which is most prod log
pipelines).

Also tightens the message: the old text ended with "... truststore {}) on "
which looked truncated. The new wording stays accurate even on the
final retry, so it doesn't contradict the LOGGER.error that fires
right after when all 3 attempts fail.

Diff

} catch (Exception e) {
- LOGGER.info(
+ LOGGER.warn(
      "reloadSslFactory :: Encountered issues when renewing SSLFactory "
      + "{} (built from key store {} and "
-     + "truststore {}) on ", baseSslFactory, keyStorePath, trustStorePath, e);
+     + "truststore {}), retrying if attempts remain",
+     baseSslFactory, keyStorePath, trustStorePath, e);
  return false;
}

Scope

Single file: pinot-common/src/main/java/org/apache/pinot/common/utils/tls/RenewableTlsUtils.java
No behavior change, no config / SPI / wire-format change

Testing

Existing RenewableTlsUtilsTest still passes (catch block isn't currently covered by a test, so no test changes needed).
Manually verified the new message renders correctly when an exception is thrown — the SLF4J trailing Throwable argument still produces the full stack trace.

Release note

none (observability-only change)

Fixes #18402

[dkranchii]

@Jackie-Jiang can you review this PR.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 63.46%. Comparing base (80fb0e8) to head (a63fb42).
⚠️ Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
...ache/pinot/common/utils/tls/RenewableTlsUtils.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #18403   +/-   ##
=========================================
  Coverage     63.46%   63.46%           
  Complexity     1701     1701           
=========================================
  Files          3254     3254           
  Lines        199104   199104           
  Branches      30830    30830           
=========================================
+ Hits         126354   126366   +12     
+ Misses        62665    62650   -15     
- Partials      10085    10088    +3     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-21	63.46% <0.00%> (+<0.01%)	⬆️
temurin	63.46% <0.00%> (+<0.01%)	⬆️
unittests	63.46% <0.00%> (+<0.01%)	⬆️
unittests1	55.41% <0.00%> (-0.01%)	⬇️
unittests2	34.99% <0.00%> (+<0.01%)	⬆️

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