Deployment.concurrency_limit cannot be zero.

[collincchoy]

This PR tweaks API schemas for the recently added Deployment.concurrency_limit field to narrow allowed values to exclude the literal value 0 as it's confusing how it intersects with concurrency_limit=None and disabling a deployment.

Important

This is technically a breaking api change and is also inconsistent with Work pool concurrency limits which similarly allow 0.
We want to do this while this feature is still rather new/in-development and to pre-empt confusion with disabling deployments.

Also worth noting that the UI will include client-side validation for this greater-than-0 behavior already

Happy to close this small PR though if we think this additional validation isn't worth it

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• If this pull request adds new functionality, it includes unit tests that cover the changes
• If this pull request removes docs files, it includes redirect settings in mint.json.
• If this pull request adds functions or classes, it includes helpful docstrings.

[codspeed-hq]

CodSpeed Performance Report

Merging #15228 will not alter performance

_{Comparing non-zero-deployment-concurrency-limits (b0158d3) with main (522c254)}

Summary

✅ 3 untouched benchmarks

[zzstoatzz]

makes sense to me! thank you

[cicdw]

good catch @collincchoy