chore: Remove docker executor

[terrytangyuan]

Fixes #7795.

Signed-off-by: Yuan Tang [email protected]

[blkperl]

@terrytangyuan There are more references to ContainerRuntimeExecutorDocker in multiple files. Specifically, workflow/controller/workflowpod.go has a lot of code related to the docker socket that can be removed

[terrytangyuan]

Where is the remaining docker socket code? I think I've removed them already.

[alexec]

Search for docker.sock?

[blkperl]

@terrytangyuan https://github.com/terrytangyuan/argo-workflows/blob/rm-docker/workflow/controller/workflowpod.go#L587

[terrytangyuan]

Done. Let me know if I missed anything else.

[rohankmr414]

There are some quickstarts for docker executor in manifests/quick-start/base/executor.