Filter Issues and Merge Requests on range for `created_at` `updated_at` timestamp

Problem to solve

Relates to migrating gitlab-triage into a native feature

gitlab-triage enables filtering issues and merge requests by timestamp fields

Intended users

Project managers looking to locate old issues or issues without updates

Further details

Use Cases

• Find old issues (created over 2 years ago)
• Find stale issues (last updated over 1 year ago)

Proposal

• Filters in the User Interface to select created or updated and then a range such as older than 6 months ago
• Parameters for the API to select created or updated and then a range such as older than 6 months ago

Permissions and Security

Normal authorization for permission to view issues and merge requests applies

Links / references

Triage migration epic:

• &636

Feature proposal:

• https://gitlab.com/gitlab-org/gitlab-ce/issues/65719