Add issue sync support for sentry plugin integrations

What does this MR do?

There are two types of GitLab integrations in Sentry:

1. a global integration (full integration)
2. a plugin integration (basically just links/creates issues)

When an issue is created in GitLab through the Error Tracking UI, we want to create a reciprocal link with the issue in Sentry. That way, users will be able to find the GitLab issue easily, regardless of where they are looking for information from.

This MR adds support for syncing issues with Sentry's plugin integration. For additional context, !23007 (merged) added support for Sentry's global GitLab integration.

Related issue: #37307 (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