- Closes #7463
- Makes table header sticky
- Clips table body so it does not overlap table header

Other changes:
- Clip table header row so it does not overlap extra columns selector
- Hide extra columns selector on local backend (PM backend)
- Focus search bar if the keypress will type regular text
- Change row height from 40px to 32px
- Add "Share" button when the editor is open
- Make entire area of backend selector (Cloud <-> Local) clickable (previously, the padding was not clickable)
- Remove the up-arrow icon to open a project. Projects are now opened by switching to the project tab using the tab selector on the top left (or by double clicking the row).
- Fix opening newly created folder (previously its entries were appended to the end, rather than under the folder)
- Indent background of "name" column (the first column)
- Minor code style changes
- Add background back to "change password" modal (oops)
- Hide "open" context menu entry and show "stop" entry, when a project is currently running
- :information_source: It might be a good idea to support the "open" action on directories as well, however it is difficult without the assets table refactor in #7540. As such, this functionality will not be added in this PR.
- Fix horizontal padding on "sign in" user menu entry
- Hide email/password validation when using oauth logins

More fixes for assets list:
- Project is inserted at start of list when there are no existing projects
- Project is inserted at start of children when there are no existing children
- Deleting a folder collapses it (hides its descendants)
- Adding children to a newly created folder puts them at the correct depth, rather than depth 1

# Important Notes
None