[Bazel] Add ENABLE_OTLP_GRPC_SSL_MTLS_PREVIEW define to otlp_grpc_log_record_exporter

[ThomsonTan]

Changes

Add missing defines = ["ENABLE_OTLP_GRPC_SSL_MTLS_PREVIEW"] to the
otlp_grpc_log_record_exporter Bazel target in exporters/otlp/BUILD.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.18%. Comparing base (37a57da) to head (0553399).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3988   +/-   ##
=======================================
  Coverage   90.18%   90.18%           
=======================================
  Files         230      230           
  Lines        7299     7299           
=======================================
  Hits         6582     6582           
  Misses        717      717           

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[marcalff]

LGTM.

Sorry I missed it earlier.