Add param for filtering AlertManagement::Alerts by status

What does this MR do?

This MR adds support for a statuses argument for fetching alerts via the graphql endpoint. The "Open" tab should include both "triggered" and "acknowledged" statuses, so the argument accepts a collection.

Expected request format:

{
  project(fullPath: "root/autodevops") {
    id
    fullPath
    alertManagementAlerts(statuses: [TRIGGERED]) {
      nodes {
        endedAt
        eventCount
        monitoringTool
        service
        severity
        startedAt
        status
        title
      }
    }
  }
}

Related issue: #215095 (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