Sketch 43 files are technically a zip file, so the JavaScript opens the
zip file & locates a preview.png which is just a quick preview of the
last sketch page edited. After that is loaded it simply places the image
into the DOM

Also improved code formatting

desired decimals for the cpu metrics

to help differentiate legends

Cleaned up some code

* Add text for the buttons on environment detail page
* Reduced the size of the charts
* Environment name is now a link

Also some general code cleanup

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/29414

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/29539

Fixed pipelines tabs not showing arrows

Some inner page tabs where not scrollable like the top nav & this caused
them to break onto new lines mobile.

This pages include:

- dashboard/projects
- project -> merge_requests
- search
- project -> milestones
- project -> pipelines

Closes #18853

Makes request to get environments

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/30149

Use more semantic `<button>` element and prevent the form from
submitting.