gitlab-agent integration branch for "Remote Development Integration Branches"

This is the integration branch in thegitlab-agent project to reflect the Category:Remote Development work.

The main purpose of this MR is to have CI pipeline coverage for the integration branch. It is not intended for individual review and will never be merged. All the work to get the code on this branch merged to master is represented by Remote Development Beta - Review and merge rail... (gitlab-org&10258 - closed)

See details in:

• The integration branch docs: https://gitlab.com/gitlab-org/remote-development/gitlab-remote-development-docs/-/blob/main/doc/integration-branch-process.md
• The associated parent issue: Tracking Issue for Remote Development Integrati... (gitlab-org/gitlab#383997 - closed)

Notes on rebasing child MRs

This MR can be rebased against master normally.

The child MRs can be rebased onto this branch with an --onto command, e.g.:

git rebase head~1 --onto remote_dev

NOTE: Use head~1 if you have squashed to a single commit, or else use whatever the SHA of the previous latest upstream commit is.

Walkthrough Video

Here is a walkthrough video of the architectural spike as of 2023-01-02:

Remote Development Architecture Spike walkthrough video

HOW TO SET UP AND VALIDATE LOCALLY

See instructions here: gitlab-org/gitlab!105783 (merged)