Refactor to extract and rename spam_action_response_fields methods

What does this MR do?

Refactor to extract and rename spam_action_response_fields methods in support of follow-on MRs !53941 (merged) and !53773

• Introduces HasSpamActionResponseFields concern which can be used in SpammableActions in future MRs.
• Renames terminology from 'spam_action_fields' to 'spam_action_response_fields' to make it clear they are used in responses, not requests.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done