Allow passing --changed cli option to vitest

[eblocha]

Command

test

Description

The unit-test builder does not provide a way to use the --changed vitest option: https://vitest.dev/guide/cli.html#changed. This will analyze the import graph and only run tests affected by a change, which is useful for running a subset of the test suite for pull requests. This option is not available through the vitest configuration file.

Describe the solution you'd like

Add a changed: <string> option to the unit-test builder options which passes --changed <string> to the vitest runner.

Describe alternatives you've considered

I don't think there are any good workarounds. Using @analogjs/vitest-angular exposes vitest directly, but requires more setup and is not an "official" package.