[AI-5939] Update readme and metrics documentation

[sarah-witt]

What does this PR do?

Adds a readme for ibm spectrum lsf, as well as documentation for metrics. Also specifies which metrics are monitored by which parameters.

Motivation

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• [ ] If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 89.07%. Comparing base (6d8718a) to head (fc08a7b). :warning: Report is 5 commits behind head on master.

Additional details and impacted files

:rocket: New features to boost your workflow:

• :snowflake: Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• :package: JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[iadjivon]

Hi Sarah, thanks for this PR, I've added this to our board for editorial review: DOCS-12849

[github-actions[bot]]

⚠️ Recommendation: Add qa/skip-qa label

This PR does not modify any files shipped with the agent.

To help streamline the release process, please consider adding the qa/skip-qa label if these changes do not require QA testing.