Add new DB seed to generate MR's for the compliance dashboard

What does this MR do?

This MR adds a new DB seed to populate all the compliance dashboards for all the groups in your local environment.

For every project, this seed will create two new merged MR's with either one or two approvers and either a successful or failed pipeline. These will then be properly displayed on the compliance dashboard of each group.

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

To test, run bundle exec rake db:seed_fu FILTER=compliance_dashboard_merge_requests and then visit /groups/[LOCAL_GROUP]/-/security/compliance_dashboard. Confirm that MR's are being shown.

• [-] 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