[Docs] Update Docs for Docker Authentication in Mac

[humblenginr]

What this PR does / why we need it:

Since Bazel does not support OSX keychain, the current documentation asks mac users to deactivate the Securely store Docker logins in macOS keychain option in Docker Desktop's preferences. This is misleading since the option is no longer present in the Docker Desktop's preferences.

There are some nuances with the way docker handles authentication and credential helpers. This PR captures my learnings and updates the docs to be in sync with the way the system behaves now.

In order to make docker store the credentials in the config.json file (so that Bazel can make use of it), we have to disable all the credential helpers. There appears to be no way to generally disable the credential helpers for all registries. But there is a way to do this on a registry-to-registry basis, which is what the updated documentation suggests we do.

Special notes for your reviewer:
References:

1. Stack Overflow - https://stackoverflow.com/a/69730718/21174500
2. Github Issue - ~/.docker/config.json reverts to default settings after a Docker Desktop restart docker/for-mac#6295

Release note:

None

[kubevirt-bot]

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[xpivarc]

/approve

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[brianmcarey]

/ok-to-test

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