Remove training-agent references and update docs

[carlory]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Fix broken integration test.

Test result:

Ran 17 of 23 Specs in 8.492 seconds
SUCCESS! -- 17 Passed | 0 Failed | 6 Pending | 0 Skipped
--- PASS: TestOmeAgentIntegration (8.49s)
PASS
ok  	github.com/sgl-project/ome/tests	8.972s
✅ Integration tests passed

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

[gemini-code-assist]

Summary of Changes

Hello @carlory, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request performs a significant cleanup by completely removing the training-agent component from the ome-agent project. This involved updating the main README.md to reflect the current command structure and directory layout, as well as a comprehensive cleanup of the integration test suite to remove all training-agent specific tests and configurations. The changes ensure that the documentation and tests are aligned with the active components of the system, addressing a broken integration test in the process.

Highlights

• Component Removal: I've removed all references and code related to the training-agent component from the project, indicating its deprecation or removal from the system's active features.
• Documentation Update: The README.md has been updated to accurately reflect the current ome-agent command structure and directory layout, removing training-agent mentions and incorporating new agent types like model-metadata, serving-agent, and fine-tuned-adapter.
• Integration Test Cleanup: The integration test suite (tests/agent_integration_test.go and tests/helpers.go) has been thoroughly cleaned up. All training-agent specific test cases, assertions, and mock configurations have been removed, which also addresses a previously broken integration test.

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[gemini-code-assist]

Code Review

This pull request is a cleanup effort to remove references to the deprecated training-agent from documentation and tests, and to fix a broken integration test. The changes are generally good and achieve the stated goal. I've pointed out a minor formatting issue in the README.md file's directory structure diagram that should be corrected for clarity.

[gemini-code-assist]

The tree structure for the ome-agent subcommands is incorrectly formatted. Using └── for serving_agent.go implies it's the last item, but fine-tuned-adapter.go follows it. Additionally, fine-tuned-adapter.go is not correctly aligned with the other items.

To fix this, serving_agent.go should use ├── and fine-tuned-adapter.go should be the last item using └── and be properly aligned. This will make the directory structure diagram accurate and easier to read.

Suggested change

	│ └── serving_agent.go # Subcommand for serving sidecar agent
	│ └── fine-tuned-adapter.go # Subcommand for fine-tuned adapter
	│ ├── serving_agent.go # Subcommand for serving sidecar agent
	│ └── fine-tuned-adapter.go # Subcommand for fine-tuned adapter