Add support for deployment.environment.name

[blairhyy-amazon]

Description

ApplicationSignalsProcessor relies on the resource attribute deployment.environment as a customer-provided override for ApplicationSignals Environment. However, deployment.environment has been deprecated and replaced with deployment.environment.name in the upstream.

Replicate the feature in CWA from this PR. Check the PR for more details.

Link to tracking issue

Testing

1. go test in applicationsignalsprocessor/internal/resolver
2. E2E testing: metrics -> ADOT SDK -> OTLP receiver -> app signal processor -> emf exporter -> any log group

• Only deployment.environment is defined -> Environment is set
• Only deployment.environment.name is defined -> Environment is set
• deployment.environment=deprecate,deployment.environment.name=test-processor -> Environment=deprecate or Environment=test-processor
• deployment.environment.name=test-processor,deployment.environment=deprecate -> Environment=deprecate or Environment=test-processor
• No environment information -> Environment=ec2:default

Documentation

[thpierce]

Changes align with aws/amazon-cloudwatch-agent#1722, will approve once testing done.