feat: include credentials in cache key for Prism Central clients

Update cache key to include endpoint address, username, password, and
insecure flag to ensure unique keys per credential set. This is necessary
because Prism Central clients use session-based authentication, where
each client maintains an authenticated session tied to specific credentials.

This ensures that clusters with different credentials get separate cached
clients, which is required for proper authentication.

Author: adarshanand25

pkg/webhook/preflight/nutanix/cache.go

@@ -4,6 +4,8 @@
 package nutanix
 
 import (
+	"fmt"
+
 	v4Converged "github.com/nutanix-cloud-native/prism-go-client/converged/v4"
 	"github.com/nutanix-cloud-native/prism-go-client/environment/types"
 	v3 "github.com/nutanix-cloud-native/prism-go-client/v3"
@@ -31,5 +33,12 @@ func (c *CacheParams) ManagementEndpoint() types.ManagementEndpoint {
 
 // Key returns a unique key for the client cache based on the management endpoint.
 func (c *CacheParams) Key() string {
-	return c.PrismManagementEndpoint.Address.String()
+	endpoint := c.PrismManagementEndpoint
+	// Include address, username, password, and insecure flag to ensure unique keys per credential set
+	return fmt.Sprintf("%s:%s:%s:%t",
+		endpoint.Address.String(),
+		endpoint.ApiCredentials.Username,
+		endpoint.ApiCredentials.Password,
+		endpoint.Insecure,
+	)
 }