GraphQL: Remove old deprecated fields from docs and API

What does this MR do?

This creates a new page and adds some removed fields to it, similar to the REST API's versioning page at https://docs.gitlab.com/ee/api/v3_to_v4.html.

The fields removed in %13.6 will be:

• Types::CommitType - :latest_pipeline
• Types::GrafanaIntegrationType - :token
• Types::IssueType Types::EpicIssueType - :designs
• Types::MergeRequestType - :merge_commit_message
• Types::TimelogType - :date

Related to #239260 (closed)

Screenshots

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