Add minTLSVersion and cipherSuites fields to the Kueue Configuration API.

Files to modify:

• apis/config/v1beta2/configuration_types.go - Add TLS fields to ControllerWebhook and ControllerMetrics structs
• apis/config/v1beta2/defaults.go - Add default values (Intermediate profile)
• apis/config/v1beta2/validation.go - Add validation for TLS settings

Proposed API additions:

type ControllerWebhook struct {
    // ... existing fields ...
    // MinTLSVersion is the minimum TLS version supported.
    // Valid values are: "1.0", "1.1", "1.2", "1.3"
    // Defaults to "1.2"
    MinTLSVersion string `json:"minTLSVersion,omitempty"`
    // CipherSuites is the list of allowed cipher suites.
    CipherSuites []string `json:"cipherSuites,omitempty"`
}

Acceptance Criteria:

• TLS fields added to Configuration API
• Default values set to Intermediate profile (TLS 1.2)
• Validation rejects invalid TLS versions and cipher names
• API documentation updated

Depends on: OCPKUEUE-450 (KEP approved)