cli/config/types: remove deprecated AuthConfig.Email field

[thaJeztah]

• depends on cli/command: explicitly map AuthConfig fields instead of a direct cast #6516

relates to:

• Remove email address field from login moby/moby#20565
• api/types/registry: remove deprecated AuthConfig.Email field moby/moby#51059
• cli/config/types: update deprecation comment for AuthConfig.Email #6366

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Relates to cli@27b2797, which forked this type from the Moby API, and cli@aab947d, which fixed the deprecation comment.

This field is no longer used since Docker 1.11 (API version 1.23) through moby@aee260d and engine-api@9a9e468, and the fix of the deprecation comment was included in the 28.4.0 release.

This patch removes the field.

- What I did

- How I did it

- How to verify it

- Human readable description for the release notes

Go SDK: cli/config/types: remove deprecated `AuthConfig.Email` field.

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[thaJeztah]

Ah! Looks like we cut some corners and did a direct convert of the type, not mapping each field;

21.67 # github.com/docker/cli/cli/command
21.67 cli/command/registry.go:53:34: cannot convert a (variable of struct type "github.com/docker/cli/cli/config/types".AuthConfig) to type registry.AuthConfig
21.67 cli/command/registry.go:74:34: cannot convert authCfg (variable of struct type "github.com/docker/cli/cli/config/types".AuthConfig) to type registry.AuthConfig
21.67 cli/command/registry.go:189:65: cannot convert authConfig (variable of struct type "github.com/docker/cli/cli/config/types".AuthConfig) to type registry.AuthConfig

[codecov-commenter]

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