Inform users when a workspace is starting using the last successful prebuild from a previous commit

[gtsiolis]

Problem to solve

Following up from 🅰️ the changes in #13944 which now allows users to skip prebuild by using the last successful prebuild, and 🅱️ the upcoming changes in #14303 which will add a project setting for always skipping prebuild in progress, users could benefit from a subtle hint on the workspace start page that informs them that a workspace is starting by using a prebuild from a previous commit.

This could be closely related to the context which is also missing on the workspace start page:

• Surface context on the workspace start page when creating a new or opening an existing workspace #13712.

Proposal

TBD (To be discussed)

Potentially using a label or plan muted text could suffice.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.