Add on premise support to identity transform

[jefchien]

Description of changes

Adds an on-prem fallback identity for the deployment.environment.name resource attribute mirroring Application Signals. A new transform_identity_fallback.yaml is used for the host mode fallback (onPrem/onPremise + any unrecognized mode). It sets the default service.name and sets deployment.environment.name to generic:default (like Application Signals). For on-prem k8s, added a new transform statement to fallback on k8s:{{k8s.cluster.name}}/{{k8s.namespace.name}} when no cloud.platform is defined (again matching Application Signals).

EC2 identity is now its own case, so the cloud.platform == "aws_ec2" guard is dropped in its transform YAML. This change + the on-prem k8s transform statement resulted in a lot of sample config YAML changes.

License

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Tests

Updated unit tests and added an onPrem test case.

Requirements

Before commiting your code, please do the following steps.

1. Run make fmt and make fmt-sh
2. Run make lint

---

Integration Tests

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[github-actions]

Binary Size Report

linux/amd64

Binary	PR	vs main (0b21e7a)	vs v1.300072.0
amazon-cloudwatch-agent	194.8 MB	+0 B	${\color{red}▲}$ +1.5 MB (+0.8%)
amazon-cloudwatch-agent-config-wizard	2.0 MB	+0 B	+0 B
config-downloader	2.0 MB	+0 B	+0 B
config-translator	2.0 MB	+0 B	+0 B
start-amazon-cloudwatch-agent	2.5 MB	+0 B	+0 B
workload-discovery	3.0 MB	+0 B	+0 B
Total	206.4 MB	+0 B	${\color{red}▲}$ +1.5 MB (+0.7%)

linux/amd64 amazon-cloudwatch-agent (last 9 main commits + this PR)

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      4235e66                             PR

linux/arm64

Binary	PR	vs main (0b21e7a)	vs v1.300072.0
amazon-cloudwatch-agent	178.6 MB	+0 B	${\color{red}▲}$ +1.5 MB (+0.9%)
amazon-cloudwatch-agent-config-wizard	2.0 MB	+0 B	+0 B
config-downloader	2.0 MB	+0 B	+0 B
config-translator	2.0 MB	+0 B	+0 B
start-amazon-cloudwatch-agent	2.4 MB	+0 B	+0 B
workload-discovery	2.9 MB	+0 B	+0 B
Total	189.9 MB	+0 B	${\color{red}▲}$ +1.5 MB (+0.8%)

windows/amd64

Binary	PR	vs main (0b21e7a)	vs v1.300072.0
amazon-cloudwatch-agent.exe	197.6 MB	${\color{red}▲}$ +7.7 KB (+0.0%)	${\color{red}▲}$ +1.5 MB (+0.8%)
amazon-cloudwatch-agent-config-wizard.exe	2.1 MB	+0 B	+0 B
config-downloader.exe	2.1 MB	+0 B	+0 B
config-translator.exe	2.1 MB	+0 B	+0 B
start-amazon-cloudwatch-agent.exe	2.3 MB	+0 B	+0 B
workload-discovery.exe	2.9 MB	+0 B	${\color{red}▲}$ +512 B (+0.0%)
Total	209.3 MB	${\color{red}▲}$ +7.7 KB (+0.0%)	${\color{red}▲}$ +1.5 MB (+0.7%)

Investigating size changes

Use go-size-analyzer to compare binaries:

GOEXPERIMENT=jsonv2 go install github.com/Zxilly/go-size-analyzer/cmd/gsa@latest
gsa diff --old <baseline-binary> --new <new-binary>