Handle vitest snapshot updates during test

[adierkens]

It's possible to have a test w/o a snapshot (on disk), generate one during the bazel test phase into the sandbox. This will cause the test to perpetually pass even though the snapshot is never actually asserted against.

Determine a way to run tests won't generate snapshots -- and include the bazel command to generate a snapshot where appropriate.

[KetanReddy]

Looks like aspect build folks have a way to do it in their rules_jest library so we can probably follow a similar approach.