Add CountUsersUsingApproveQuickActionMetric

What does this MR do?

• Add CountUsersUsingApproveQuickActionMetric
• Add instrumentation classes for 20210216181506_i_quickactions_approve_weekly.yml and 20210216181508_i_quickactions_approve_monthly.yml

Screenshots (strongly suggested)

Usage Ping with this changes

=> {:uuid=>"7cc411ec-c1c7-46ea-93fd-1563342e6137",
 :redis_hll_counters=>{:quickactions=>{:i_quickactions_approve_monthly=>0, :i_quickactions_approve_weekly=>0}},

Previous MR !59649 (merged)

Related issue #299448 (closed)

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
  • I have not included a changelog entry because user facing change.
• [-] 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

Related issue #299448 (closed)