feat: Added labels.enabled and labels.exclude to config defaults

[svetlanabrennan]

Description

Updated default configs to accept application_logging.forwarding.labels.enabled and application_logging.forwarding.labels.exclude to support adding labels to log records.

Docs website will be updated with these configs in #2716

How to Test

Added and updated unit tests

Related Issues

Closes #2713
Relates to #2716

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.94%. Comparing base (a901a24) to head (1017cff).
Report is 6 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (a901a24) and HEAD (1017cff). Click for more details.

HEAD has 11 uploads less than BASE

Flag	BASE (a901a24)	HEAD (1017cff)
unit-tests-18.x	1	0
unit-tests-20.x	1	0
integration-tests-cjs-18.x	1	0
integration-tests-cjs-22.x	1	0
integration-tests-cjs-20.x	1	0
integration-tests-esm-18.x	1	0
integration-tests-esm-22.x	1	0
integration-tests-esm-20.x	1	0
versioned-tests-18.x	1	0
versioned-tests-22.x	1	0
versioned-tests-20.x	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2727      +/-   ##
==========================================
- Coverage   97.25%   88.94%   -8.32%     
==========================================
  Files         294      276      -18     
  Lines       46198    44743    -1455     
==========================================
- Hits        44930    39795    -5135     
- Misses       1268     4948    +3680     

Flag	Coverage Δ
integration-tests-cjs-18.x	?
integration-tests-cjs-20.x	?
integration-tests-cjs-22.x	?
integration-tests-esm-18.x	?
integration-tests-esm-20.x	?
integration-tests-esm-22.x	?
unit-tests-18.x	?
unit-tests-20.x	?
unit-tests-22.x	88.94% <100.00%> (+<0.01%)	⬆️
versioned-tests-18.x	?
versioned-tests-20.x	?
versioned-tests-22.x	?

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