[24.0 backport] login: Add message about using PATs

[neersighted]

• Backport of login: Add message about using PATs #4478
• Slight conflict due to a lack of cli/command: remove deprecated EncodeAuthToBase64 #4280

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- What I did

Added a hint about using PATs

$ docker loginLog in with your Docker ID or email address to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com/ to create one.You can log in with your password or a Personal Access Token (PAT). Using a limited-scope PAT grants better security and is required for organizations using SSO. Learn more at https://docs.docker.com/go/access-tokens/Username: 

- How I did it

- How to verify it

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

Merging #4500 (1160626) into 24.0 (27a1996) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

Additional details and impacted files

@@ Coverage Diff @@## 24.0 #4500 +/- ##
==========================================
- Coverage 59.27% 59.26% -0.02% 
==========================================
Files 288 286 -2 Lines 24810 24810 ==========================================
- Hits 14707 14703 -4 - Misses 9215 9218 +3 - Partials 888 889 +1 

[thaJeztah]

Slight conflict due to a lack of #4190

Should we consider backporting that one as a whole, or not worth it? (I need to recall the exact cases where it fixes things)

[neersighted]

I don't think it's worth it -- it was de-duplication of code/removal of deprecated functions, with the exception of:

cli/command: ConfigureAuth: fix terminal state not being restored on error

which doesn't cleanly apply (due to other cleanup) -- up to you, but I'm not sure it's worth it myself.

[thaJeztah]

Looks like the wrong "missing" PR was linked; this is the one not in v24;

• cli/command: remove deprecated EncodeAuthToBase64 #4280

[thaJeztah]

LGTM