[Feature Request] Snapshot updates update only selected test when `runAllTestsInAffectedTestFile` is enabled

[skinsapp]

Issue description or question

When runAllTestsInAffectedTestFile is set to true, snapshot updates should only update the selected test, not all tests.

This is especially useful in the Test Explorer web app.

It's somewhat of a bug, as the expectation when clicking the camera icon is that only snapshots for a single test update. Without this capability, you shy away from making snapshot updates.