Improve the header section on Workspace details page
MR: Pending
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## Description
As part of our [new designs for Workspaces](https://gitlab.com/groups/gitlab-org/-/epics/18674), we need to improve the existing header section (https://gitlab.com/gitlab-org/gitlab/-/issues/566544+) so that users can quickly identify the workspace, its current status, and associated repository information.
## Visual Changes

## Acceptance criteria
- [ ] Display workspace description or name prominently in the header
- [ ] Add coloured status indicator dot next to workspace name
- [ ] Show repository path (e.g., "GitLab.org/gitlab-ui") with clickable link to repository
- [ ] Display branch information with change counts and commits behind
- [ ] Branch information is clickable and links to the branch view
## TODO: Implementation plan
- Implement workspace title display using workspace name or description
- Add status indicator component using existing enhanced status indicator patterns
- Display repository information with proper link generation to GitLab repository
- Implement branch information display using data from [branch & local files information](https://gitlab.com/gitlab-org/gitlab/-/issues/565017)
- Add proper click handlers for repository and branch navigation
- Style header section following GitLab design system header patterns
## Technical Notes
- **Status Indicator:** Reuse enhanced status indicator component with coloured dots from previous workspace card work (See: https://gitlab.com/gitlab-org/gitlab/-/issues/562357+s)
- **Branch Data:** Uses branch and local changes information implemented in https://gitlab.com/gitlab-org/gitlab/-/issues/563085+s & https://gitlab.com/gitlab-org/gitlab/-/issues/565017+s
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