Updates all bootstrap "remove" buttons to "danger"

What does this MR do?

This MR does a find/replace for all the "remove" buttons from bootstrap and updates them to use the "danger" GitLab UI style.

This is part of a find and replace effort to remove bootstrap buttons from all the haml files in the codebase.

touches #231034 (closed) #231214 (closed) #231136 (closed) #231134 (closed) #231145 (closed) #231219 (closed) #231210 (closed) #231146 (closed) #231179 (closed) #231055 (closed) #231066 (closed) #231098 (closed) #231070 (closed) #231171 (closed) #231141 (closed) #231114 (closed)

closes #231161 (closed) #231062 (closed) #231227 (closed) #231089 (closed) #231212 (closed) #231202 (closed) #231142 (closed)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

This may break the styles of some buttons, though it's highly unlikely. Since we have over 200 directories, most of which have multiple files, some of which have multiple buttons, we can't check them all.

• 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