Add job to update open PRs with S-Merge-Conflicts

[Zeophlite]

Objective

• Fixes Add a bot to label / unlabel PRs with merge conflicts #25356
• Allows for reviewers to search for ready PRs with is:pr is:open -label:S-Merge-Conflicts -author:@me label:S-Needs-Review -reviewed-by:@me

Solution

• Add a daily action to run the script

Testing

• Ran script locally, not sure if anything specific is required to work in

[github-actions]

You added a new example but didn't add metadata for it. Please update the root Cargo.toml file.

[Zeophlite]

I presume the security tab has suggestions for the above issues

[github-actions]

You added a new example but didn't add metadata for it. Please update the root Cargo.toml file.

[mockersf]

10000 is a lie, it's limited at 1000
cli/cli#3836

[Zeophlite]

That is annoying :(

[mockersf]

I'm not sure this would work unless there are no pr merged to main between two runs
the conflict state is computed lazily, unknown by default

• run, no status, but triggers its computation
• something is merged to main, all status are cleared in GitHub cache
• next day, run, no status, but triggers its computation

[Zeophlite]

I'm not sure this would work unless there are no pr merged to main between two runs the conflict state is computed lazily, unknown by default

* run, no status, but triggers its computation

* something is merged to main, all status are cleared in GitHub cache

* next day, run, no status, but triggers its computation

Ah right, the workflow's meant to run the script twice if needed