Common directory and blob page structure changes
The common elements of the page will be the following
- Removal of buttons at the top of the page and placed closer to actions
- "Find file" in file path
- "History" in commits information block
- "Permalink" in overflow actions menu
- Moving "copy file path" to the header area
- Pending https://gitlab.com/gitlab-org/gitlab-design/-/issues/2521+
- Introducing a title to the page
- Formalization of location of primary action (top right of page)
- Sticky header to maintain context and make accessing the actions easier as the user scrolls

## Design file
:art: [Figma: Create SSOT Files - Repository](https://www.figma.com/file/eq2nf3B8MhB9xKrC0VzbPf/Repository?type=design&node-id=808%3A226698&mode=design&t=2QM9DkbQpYYKb2JL-1)
epic