Replace context switcher with header in sidebar
What does this MR do and why?
Replace context switcher with header in sidebar
Now that the global search modal replicates the functionality of the context switcher (see #409522 (closed) and #415809 (closed) for prior work), the context switcher can be removed.
In its place, a static header specific to each panel type is shown at the top of the sidebar. The old context header (which was the toggle for the context switcher when logged in, and a non-interactive element when logged out) has largely been replaced by changing the "main" or "overview" link for the current context (if there is one). It now displays the current context's name (when appropriate), and shows that entity's avatar.
This does not remove the frontend code for the context switcher. That will be done in a follow-up.
Addresses #415811 (closed).
See individual commit messages for more detail.
Screenshots or screen recordings
| Context | Before | After |
|---|---|---|
| Your work |  |
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| Explore |  |
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| Admin area |  |
 |
| Group (without avatar) |  |
 |
| Group (with avatar) |  |
 |
| Project (without avatar) |  |
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| Project (with avatar) |  |
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| User profile |  |
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| User settings |  |
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| Search results |  |
 |
How to set up and validate locally
- Ensure the new navigation is enabled.
- Visit each of the different page contexts listed in the screenshots.
- Disable the new nav, and verify that the old nav is unaffected by these changes.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #415811 (closed)