feat(frontend) Move shoot-specific defaults from branching logic to vendor configurations

[grolu]

What this PR does / why we need it:

Moves shoot-specific defaults from branching logic in utils/shoot.js into the infrastructure vendor configurations.

This includes:

• Provider, networking, and Kubernetes templates
• Zone-networking strategies
• Control-plane zone strategies
• Provider-specific zone behavior
• AWS worker volume and worker provider configuration

useShootContext now resolves these settings through the configured infrastructure vendor. The AWS IOPS behavior introduced by #2951 is preserved:

• The provider type is read from cloudProfile.spec.type
• IOPS is hidden for gp2
• IOPS is required for io1 and io2

The PR also adds default shoot manifest coverage for all configured infrastructure providers and focused regression coverage for the AWS volume behavior.

Which issue(s) this PR fixes:

None.

Special notes for your reviewer:

This is intended to be a behavior-preserving refactoring that makes shoot defaults extensible through vendor configuration.
This is the last slice of #2824

Release note:

Infrastructure-provider shoot defaults and templates now live in the provider's `shoot` configuration under `frontend/src/data/vendors/infra` instead of provider-specific branching in `utils/shoot.js`

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