Improvements made on Metrics file

[gabrielademoraes]

Proposed Changes

In this PR, two methods were created intending to make the openMetrics method has single responsibility, because it was opening the metrics and deactivating the tablinks and tabcontents. https://github.com/falko-org/Falko/issues/407

Type of Changes

• [ ] Bugfix
• [x] New Feature

Checklist

• [ ] This Pull Request has a significant name.
• [ ] The build is okay (tests, code climate).
• [x] This Pull Request mentions a related issue.

Screenshots