feat: add quirks for RegistryAuthConfig support

[Unix4ever]

Config is supported starting from Talos version 1.12.0.

[Copilot]

Pull request overview

Adds a new imager quirk to detect whether a Talos version supports the RegistryAuthConfig multi-document config, matching the stated support threshold of Talos 1.12.0.

Changes:

• Added SupportsRegistryAuthConfig() with a 1.12.0 minimum version.
• Added unit coverage for unsupported, supported, prerelease, and unparsable/latest-version behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/machinery/imager/quirks/quirks.go	Adds the RegistryAuthConfig support quirk.
pkg/machinery/imager/quirks/quirks_test.go	Adds tests for the new quirk behavior.

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[smira]

we don't need this, it's already gated with network multi-doc

talos/pkg/machinery/config/generate/registry.go

Lines 21 to 22 in ecb7d45

	if !in.Options.VersionContract.MultidocNetworkConfigSupported() {
	// old-style registry config

But also you can't really do authenticated Image Factory without it, as it will not be able to do e.g. upgrade in maintenance mode without multi-doc

[Unix4ever]

we don't need this, it's already gated with network multi-doc

talos/pkg/machinery/config/generate/registry.go

Lines 21 to 22 in ecb7d45

	if !in.Options.VersionContract.MultidocNetworkConfigSupported() {
	// old-style registry config

But also you can't really do authenticated Image Factory without it, as it will not be able to do e.g. upgrade in maintenance mode without multi-doc

A bit confusing but alright. Easier for me actually :)