Apollo boards - Error handling

What does this MR do and why?

Error handling for apollo boards

Behind :apollo_boards feature flag

Screenshots or screen recordings

Error example

How to set up and validate locally

1. Turn on :apollo_boards feature flag
2. Visit a board
3. To validate that an error is thrown for a specific query, comment out a variable for example
4. Execute the action matching the query
5. The error banner should display

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #388735 (closed)