Rename 'uv-ecosystem' to 'uv-and-helpers'

[Nishnha]

What are you trying to accomplish?

Trying to fix the broken/stuck uv-ecosystem multi-ecosystem group #13136 by renaming the group, which should create a new PR

Anything you want to highlight for special attention from reviewers?

This is an alternative to #14853

How will you know you've accomplished your goal?

We start receiving uv Dependabot updates again.

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.

[Copilot]

Pull request overview

Renames the Dependabot multi-ecosystem group used for the uv + helpers updates to force creation of a new grouped PR (intended to unblock the currently stuck/broken group PR).

Changes:

• Renamed the multi-ecosystem-groups key from uv-ecosystem to uv-and-helpers.
• Updated the /uv (docker) and /uv/helpers (pip) update entries to reference the new group name.

Show a summary per file

File	Description
.github/dependabot.yml	Renames the multi-ecosystem group and updates references so Dependabot will open a fresh grouped PR for uv-related updates.

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 0