deploy: feat(mcp-registry): publish custom tools server to mcp-registry (googleapis#1834)

## Description

This PR adds a new [github
action](https://github.com/modelcontextprotocol/registry/blob/main/docs/guides/publishing/github-actions.md)
workflow to publish Toolbox to mcp-registry. This only publishes the
custom tools server, prebuilt-tools will be added in a different PR once
this is successful.

The workflow will be triggered on (1) any new release tag (v*) or (2)
manually via GHA workflow dispatch. It will grab the version number from
the `server.json` file.

The server.json file will be updated by release please during every
release.

Note: server that are published in the mcp-registry is immutable. In
cases where we successfully published a server and would like to make an
update, we will have to update the `version` field in
`.registry/server.json` and manually publish another server with a new
version.

## PR Checklist

> Thank you for opening a Pull Request! Before submitting your PR, there
are a
> few things you can do to make sure it goes smoothly:

- [x] Make sure you reviewed

[CONTRIBUTING.md](https://github.com/googleapis/genai-toolbox/blob/main/CONTRIBUTING.md)
- [x] Make sure to open an issue as a

[bug/issue](https://github.com/googleapis/genai-toolbox/issues/new/choose)
  before writing your code! That way we can discuss the change, evaluate
  designs, and agree on the general idea
- [x] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)
- [x] Make sure to add `!` if this involve a breaking change

🛠️ Fixes googleapis#1659

Issue at mcp-registry to support GAR
([googleapis#427](modelcontextprotocol/registry#427)) aec8897

Author: pull[bot]

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