Stabilize log record event name

[jack-berg]

The log record event name field is now stable (spec, proto).

[codecov]

Codecov Report

Attention: Patch coverage is 80.95238% with 4 lines in your changes missing coverage. Please review.

Project coverage is 89.60%. Comparing base (4e457f7) to head (a472d31).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...elemetry/sdk/logs/ExtendedSdkLogRecordBuilder.java	0.00%	1 Missing ⚠️
.../io/opentelemetry/sdk/logs/ReadWriteLogRecord.java	0.00%	1 Missing ⚠️
.../opentelemetry/sdk/logs/SdkReadWriteLogRecord.java	75.00%	1 Missing ⚠️
.../io/opentelemetry/sdk/logs/data/LogRecordData.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## main #7277 +/- ## ============================================ - Coverage 89.61% 89.60% -0.01%  - Complexity 6858 6859 +1  ============================================ Files 780 780 Lines 20718 20724 +6 Branches 2020 2018 -2 ============================================ + Hits 18566 18570 +4  - Misses 1512 1514 +2  Partials 640 640 

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