Provide better UX and error handling for bulk actions that can't be executed

[ckbedwell]

Problem

When selecting multiple checks to bulk remove probes, if one of the checks only has a single probe (so removing it would result in it having zero probes which is invalid), the request errors and is unable to complete with no useful feedback except the update failed.

Acceptance criteria

Please explore options to handle this for the best UX:

1. Present a more useful error message indicating the problematic check allowing the user to take action to correct it
2. Carry out the request where possible but exclude the problematic check and highlight the probes weren't removed from this check.

Please ensure the implemented solution has adequate integration tests.

[peterschretlen]

This may be a change required in the API, as the response does not indicate what action can't be performed.
TBD what the expected behaviour is.

Could:

• Perform the actions that can be performed.
• Indicate the subset of actions that failed.

Alternative is we continue with the all-or-nothing behaviour, but provide better messaging