Always perform local docker login in 'cwctl registrysecrets add'

[hhellyer]

Codewind version:
OS: All

Description:
At the moment when the command cwctl registrysecrets add is run we do a local docker login if the secret is being added to a local connection.
As discussed here: #1306 (comment) we should change this so we always do the local docker login whether we are working with a local or remote connection. This will be more consistent and let us simplify the docs when using appsody.

This is a small fix as we just need to move the code in cwctl but we should make sure this change is reflected in the docs once we have completed it.

Workaround:
Currently (as documented) the user needs to run docker login manually to make sure appsody init works for projects building on a remote instance of codewind.

[hhellyer]

This has been added to eclipse-archived/codewind-installer#414 as that hasn't been merged yet.

[codewind-bot]

@hhellyer - this issue is now ready to be verified.

[hhellyer]

This is done, we always do the docker login whatever the path and the docs reflect this. (It was writing the docs that highlighted this issue in the first place.)