Build: Build marked as retry isn't canceled correctly

[stsewd]

Details

If a build marked as retry is canceled, the build stays in the "triggered" state.

https://app.readthedocs.org/projects/vllm/builds/30458398/

Even it appears in when filtering by active builds: https://app.readthedocs.org/projects/vllm/builds/?version__slug=&state=active&version__type=

Expected Result

Since the build was canceled, it should appear as such, and not being mixed with active builds.

[humitos]

This is probably the same case we are tracking in #12492