[IDE] Improve UI presentation of context source hover
<!--IssueSummary start-->
<details>
<summary>
Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards.
</summary>
- [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=546255)
</details>
<!--IssueSummary end-->
# Problem to solve
The current hover takes up a lot of space and is a bit awkward to read.
See https://gitlab.com/gitlab-org/editor-extensions/meta/-/issues/223 for more details on the problem and user feedback.
## Why it's important
This will make it easier for users to quickly understand details about a context source (e.g. project, path, type).
## Proposal
```gherkin
Scenario: User hovers a context source in the context menu
Given the user has the context menu open
And the user hovers a context source with the mouse
Then show the hover tip above the context source
```
```gherkin
Scenario: User hovers a context source in the prompt input
Given a context source token is shown in the prompt input
And the user hovers a token with the mouse
Then show the hover tip above the token
```
## Example
| Current | Proposed |
| ------ | ------ |
|  | [](https://gitlab.com/gitlab-org/gitlab/-/issues/546255/designs/ContextMenu_addsource.png) |
## Important links
- [Figma](https://www.figma.com/design/py1XaoxXhPpc1jFocBMUnx/%E2%AD%90-Duo-in-the-IDE--16983?node-id=3581-8990&t=qlJE8xkWORZTMdcK-1)
- [Prototype iteration 3](https://prototyping-939024.gitlab.io/) (to illustrate the concept, not a 1:1 spec)
issue