refactor: AWS Bedrock llm events refactor

[amychisholm03]

Description

Refactors AWS Bedrock LLM events and related helper classes to use the new abstraction.

How to Test

npm run unit
npm run versioned:major aws-sdk-v3

Related Issues

Part of #3687

[codecov]

Codecov Report

❌ Patch coverage is 99.22481% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.76%. Comparing base (f1e3a0e) to head (bc5e217).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/llm-events/aws-bedrock/embedding.js	96.77%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (f1e3a0e) and HEAD (bc5e217). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (f1e3a0e)	HEAD (bc5e217)
integration-tests-esm-20.x	1	0
versioned-tests-22.x	1	0
versioned-tests-20.x	1	0
unit-tests-24.x	1	0
unit-tests-22.x	1	0
unit-tests-20.x	1	0
integration-tests-cjs-24.x	1	0
integration-tests-cjs-22.x	1	0
integration-tests-esm-24.x	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3759      +/-   ##
==========================================
- Coverage   97.89%   89.76%   -8.13%     
==========================================
  Files         454      448       -6     
  Lines       58726    58316     -410     
  Branches        1        1              
==========================================
- Hits        57489    52348    -5141     
- Misses       1237     5968    +4731     

Flag	Coverage Δ
integration-tests-cjs-20.x	74.36% <55.03%> (+0.05%)	⬆️
integration-tests-cjs-22.x	?
integration-tests-cjs-24.x	?
integration-tests-esm-20.x	?
integration-tests-esm-22.x	53.08% <55.03%> (+<0.01%)	⬆️
integration-tests-esm-24.x	?
unit-tests-20.x	?
unit-tests-22.x	?
unit-tests-24.x	?
versioned-tests-20.x	?
versioned-tests-22.x	?
versioned-tests-24.x	81.25% <99.22%> (-0.38%)	⬇️

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