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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