[support-infra] Improve GitHub Action that check PRs labels

[oliviertassinari]

A few enhancements:

• Restrict the permissions; we only need read access
• Run the action from the PR, not from the target, so we can more easily iterate on this logic. As long as it has no write permissions, we are good.
• Sort keys to match the other actions

Context: I was cleaning up a bit the issue description of mui/mui-public#206, I read this file, and it seemed strange.

[mui-bot]

Deploy preview: https://deploy-preview-19303--material-ui-x.netlify.app/

Bundle size report

Bundle	Parsed size	Gzip size
@mui/x-data-grid	0B(0.00%)	0B(0.00%)
@mui/x-data-grid-pro	0B(0.00%)	0B(0.00%)
@mui/x-data-grid-premium	0B(0.00%)	0B(0.00%)
@mui/x-charts	0B(0.00%)	0B(0.00%)
@mui/x-charts-pro	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers-pro	0B(0.00%)	0B(0.00%)
@mui/x-tree-view	0B(0.00%)	0B(0.00%)
@mui/x-tree-view-pro	0B(0.00%)	0B(0.00%)

Details of bundle changes

Generated by 🚫 dangerJS against a81bb62

[michelengelen]

We need to monitor if we maybe need to switch back to target...

The permissions were needed before, when we were still adding a comment. I did forget to clean that up, sry!

[oliviertassinari]

We need to monitor if we maybe need to switch back to target

Agree, I'm merging, I will test it and report back here.

when we were still adding a comment.

Oh, ok, so we can do this too: mui/mui-public#602.

[oliviertassinari]

Agree, I'm merging, I will test it and report back here.

Ok, all good, it still works. Proof:

#19304