feat(appName): add appName via annotation

[paologallinaharbur]

This PR introduce a new small feature.

Whenever the annotation newrelic.com/app-name is found in an instrumentation CR, all the container instrumented thanks to that instrumentation CR will leverage the value of such annotation to populate NEW_RELIC_APP_NAME.

If the annotation is not present or if the user was specifying the APP_NAME via environment variable the behaviour is not changed

[codecov]

Codecov Report

❌ Patch coverage is 72.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.94%. Comparing base (aeb670c) to head (986bc01).

Files with missing lines	Patch %	Lines
internal/apm/dotnet.go	0.00%	0 Missing and 1 partial ⚠️
internal/apm/dotnetwindows.go	0.00%	0 Missing and 1 partial ⚠️
internal/apm/java.go	0.00%	0 Missing and 1 partial ⚠️
internal/apm/nodejs.go	0.00%	0 Missing and 1 partial ⚠️
internal/apm/php.go	0.00%	0 Missing and 1 partial ⚠️
internal/apm/python.go	0.00%	0 Missing and 1 partial ⚠️
internal/apm/ruby.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #517      +/-   ##
==========================================
+ Coverage   68.74%   68.94%   +0.20%     
==========================================
  Files          53       53              
  Lines        3513     3520       +7     
==========================================
+ Hits         2415     2427      +12     
+ Misses        863      861       -2     
+ Partials      235      232       -3     

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