Log an obfuscate invalid keys added as attributes to logs and events

[jtduffy]

For invalid attributes added to log and events:

• Now logged at FINEST level rather than WARNING to reduce log spam
• Key values are now part of the log message. If the key is larger than 3 characters, it's obfuscated -- first character + *** + the last character. For example, MY_LARGER_KEY would print to the log as M***Y

Resolves #2369

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 70.53%. Comparing base (c446699) to head (8053d79).

Files with missing lines	Patch %	Lines
...ic/agent/service/logging/LogSenderServiceImpl.java	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2388      +/-   ##
============================================
+ Coverage     70.52%   70.53%   +0.01%     
- Complexity    10035    10039       +4     
============================================
  Files           844      844              
  Lines         40642    40650       +8     
  Branches       6161     6164       +3     
============================================
+ Hits          28661    28673      +12     
  Misses         9198     9198              
+ Partials       2783     2779       -4     

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