[Bugfix] Fix Nemotron Parse loading

[DarkLight1337]

Purpose

• Fix Nemotron Parse not able to be loaded since [Model] Add LoRA support for Whisper models #29856. The test wasn't effectively being run as per [CI Failure]: Spawned tests can fail silently #34323 so we never caught the issue
• Remove core_model tag from Keye-VL and Nemotron Parse tests as they are less important

Test Plan

Test Result

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft in the Google Doc.

[gemini-code-assist]

Code Review

This pull request updates test markers by removing the core_model tag and unnecessary create_new_process_for_each_test usage, which aligns with the goal of refining the test suite. It also re-enables a previously skipped test. The most significant change is a fix in nemotron_parse.py intended to correct weight loading. However, this fix appears to introduce a new issue by using integer shard IDs for a layer that expects string identifiers, which could cause a crash. I've provided a critical review comment with a suggested correction for this.

[DarkLight1337]

Multi-Modal Models (Extended) 2 should be fixed in #37324 so let's merge that one first

[mergify]

Hi @DarkLight1337, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

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Tip

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pre-commit run --hook-stage manual mypy-3.10