Adds support for a `/test` command, without breaking the existing
`/ok-to-test` habits.
This is a _sloppy_ version of `/ok-to-test`. Turns out humans are
sloppy. So let's embrace the human. 🤯
Example incantation:
```
/test sanity workflow
```
The sloppy parser at work:
Of course, if a PR body contains `/ok-to-test`, that takes precedence,
and any `/test` is ignored.
We're also moving the logic of parsing the tags to a separate Javascript
file. It's still not in a form that's easily testable, perhaps, but I
hope this is a start for us to get to a "unit-tested CI". ❤️
---------
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
## Description
Add a check to validate PRs
Fixes #`32763`
## Automation
/ok-to-test tags=""
### 🔍 Cypress test results
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> [!CAUTION]
> If you modify the content in this section, you are likely to disrupt
the CI result for your PR.
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Integrated a new workflow step to validate tags in pull requests,
providing guidance for corrections and halting the workflow if tags are
incorrect.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
