Easy transition from viewing a files at a specific position to editing at the same position (line)
This is to follow up on the proposal in https://gitlab.com/groups/gitlab-org/-/epics/9913#note_1283111893:
### Release notes
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### Problem to solve
When I browse files and realize I want to change something, I want to have a fast and simple experience to make that change and commit it. (not validated)
### Proposal
> add another icon here that shows a :pencil2:
>
> 
>
> and deeplinks you to the line item in the single file editor.
>
> 
#### YOUTUBE: Create::Source Code. In-line editing of blobs PoC walkthrough
https://www.youtube.com/watch?v=QyC36h_QIYQ:
[](https://www.youtube.com/watch?v=QyC36h_QIYQ "Create::Source Code. In-line editing of blobs PoC walkthrough")
#### Related Youtube videos:
* [Create::Source Code. The "in-line" editing meets "in-context" editing PoC walkthrough](https://www.youtube.com/watch?v=ZndR87sMQl0)
* [Create::Source Code. In-context editing PoC walkthrough](https://www.youtube.com/watch?v=TKPSF-XfgSY)
#### Related Epic:
* https://gitlab.com/groups/gitlab-org/-/epics/3601+
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