chore(llmobs): remove public notice of submit_evaluation_for

[lievan]

We're holding off on a public release of joining by tag for evaluation metrics. This PR removes the deprecation notice for submit_evaluation, the predecessor to submit_evaluation_for, and removes the release note for submit_evaluation_for.

We don't revert the entire original PR because:

• any urgent customers blocked on joining by tag can use submit_evaluation_for in an "early access" mode
• we still want to keep the changes that updates the eval metric writer to write to the v2 eval metric endpoint

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

ddtrace/llmobs/_llmobs.py                                               @DataDog/ml-observability

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: evan.li/submit-eval-rel
Commit report: 0e8c420
Test service: dd-trace-py

✅ 0 Failed, 130 Passed, 1468 Skipped, 4m 57.44s Total duration (35m 43.36s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-21 19:43:13

Comparing candidate commit ff4d5d5 in PR branch evan.li/submit-eval-rel with baseline commit f198341 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 384 metrics, 0 unstable metrics.