This is aligning with EE

spacing updates to expander button
sub-title fixes

fixed some more breadcrumb titles

[ci skip]

Closes #36561

`breadcrumb_title` is then overriden when needed

The closed & backlog lists in issue boards are no collapsible. They can
be collapsed independently of each other & this selection is then saved
to the browser through localStorage. When the page loads, the code gets
the data from localStorage & determines whether to show or hide the list

Closes #23917

This is one step closer to making the transition to .vue files for issue boards

[ci skip]

Closes #28312

Moved the issue boards card template into the JS. This helps to improve
the code coverage & will eventually make it easier to move this to .vue
files

Fixed users href path being incorrect

This removes the backlog list & instead creates a modal window that will
list all issues that are not part of a list for easy adding onto the
board

Closes #26205

Changed return statement instead of if
Delete objects after issue is closed