Switch TopologySpreadConstraint.when_unsatisfiable to enum

[bashofmann]

This makes typing in the UI a lot easier and usage safer. We also do this for similar fields in Toleration.

[bashofmann]

No one is using this feature yet, so it's safe to do this breaking change: https://grafana-monitoring.cloud.qdrant.io/explore?schemaVersion=1&panes=%7B%222pr%22:%7B%22datasource%22:%22postgresql-1%22,%22queries%22:%5B%7B%22refId%22:%22A%22,%22datasource%22:%7B%22type%22:%22grafana-postgresql-datasource%22,%22uid%22:%22postgresql-1%22%7D,%22format%22:%22table%22,%22rawSql%22:%22select%20count%28topology_spread_constraints%29%20from%20cluster_configurations%20where%20topology_spread_constraints%20is%20not%20null%20and%20topology_spread_constraints%20%21%3D%20%27%7B%7D%27%22,%22editorMode%22:%22code%22,%22sql%22:%7B%22columns%22:%5B%7B%22type%22:%22function%22,%22parameters%22:%5B%5D%7D%5D,%22groupBy%22:%5B%7B%22type%22:%22groupBy%22,%22property%22:%7B%22type%22:%22string%22%7D%7D%5D,%22limit%22:50%7D,%22dataset%22:%22postgres%22,%22rawQuery%22:true%7D%5D,%22range%22:%7B%22from%22:%22now-1h%22,%22to%22:%22now%22%7D,%22compact%22:false%7D%7D&orgId=1

[github-actions]

The latest Buf updates on your PR. Results from workflow Pull Request / linting (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	⏩ skipped	Jan 29, 2026, 2:29 PM

[github-actions]

PR Packages Published

Python Package:

• Version: 0.96.0.dev287+4a80425
• Package: qdrant-cloud-public-api
• Registry: https://us-python.pkg.dev/qdrant-cloud/python/
• To update run: uv add qdrant-cloud-public-api==0.96.0.dev287+4a80425

NPM Package:

• Version: 0.96.0-dev287.4a80425
• Package: @qdrant/qdrant-cloud-public-api
• Registry: https://us-npm.pkg.dev/qdrant-cloud/npm/
• To update run: npm install @qdrant/qdrant-cloud-public-api@0.96.0-dev287.4a80425

[github-actions]

It looks like the PR doesn't include updates for the generated code.

Please make sure you've run the following commands from the root directory:

make generate

Once you've added them, you can dismiss this review.

Done

[lomidzemikheili]

LGTM!