Add UserCalloutDismisser component

What does this MR do?

Add UserCalloutDismisser component

This is a renderless component that encapsulates the query/mutation behaviours of working with UserCallouts.

The component is essentially a less generic combination of both the ApolloQuery and ApolloMutation components. I wanted to make the slot props API similar, but given that this didn't need to be so generic, I decided against that and chose slot props that made the most sense for this use case.

This adds the component and specs, and also moves the existing get_user_callouts.query.graphql file to a shared location.

Finally, this is based in part on the prior art in !59297 (merged) and !60024 (merged).

Part of #332691 (closed).

Screenshots (strongly suggested)

n/a

Does this MR meet the acceptance criteria?

Conformity

• [-] I have included a changelog entry, or it's not needed. (Does this MR need a changelog?)
• [-] I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• [-] I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.

Availability and Testing

• I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)
• [-] I have tested this MR in all supported browsers, or it's not needed.
• [-] I have informed the Infrastructure department of a default or new setting change per definition of done, or it's not needed.