Support in-context and in-line editing for Blobs
<!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Proposal Make it easier for users to quickly edit a blob without losing the context they're in when seeing the blob page. See PoC MRs in: * https://gitlab.com/gitlab-org/gitlab/-/merge_requests/116057 * https://gitlab.com/gitlab-org/gitlab/-/merge_requests/116050 * https://gitlab.com/gitlab-org/gitlab/-/merge_requests/116055 <!-- Use this section to explain the feature and how it will work. It can be helpful to add technical details, design proposals, and links to related epics or issues. --> <!-- Consider adding related issues and epics to this issue. You can also reference the Feature Proposal Template (https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/issue_templates/Feature%20proposal%20-%20detailed.md) for additional details to consider adding to this issue. Additionally, as a data oriented organization, when your feature exits planning breakdown, consider adding the `What does success look like, and how can we measure that?` section. --> <!-- Label reminders Use the following resources to find the appropriate labels: - Use only one tier label choosing the lowest tier this is intended for - https://gitlab.com/gitlab-org/gitlab/-/labels - https://about.gitlab.com/handbook/product/categories/features/ -->
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