Display GitLab issues created via Sentry's global GitLab integration

What does this MR do?

Sentry has two types of integrations with GitLab - a plugin integration (now deprecated) and a global integration (introduced in Sentry 9.1.2). The error detail view of Sentry issues in GitLab displays any GitLab issues which have been linked to the error through Sentry's plugin integration. This MR adds support to also display issues created via the global integration.

#198275 (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

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team