fix: update kms_key_id validation to accept all AWS-supported formats

fix: update kms_key_id validation to accept all AWS-supported formats

- Changed ValidateFunc from verify.ValidARN to verify.ValidKMSKeyID
- Now accepts key ID, key alias, key ARN, and alias ARN
- Matches AWS API documentation requirements
- Fixes documentation ambiguity reported in #44505

Author: Nawazxam

internal/service/ec2/ec2_launch_template.go

@@ -84,7 +84,7 @@ func resourceLaunchTemplate() *schema.Resource {
 									names.AttrKMSKeyID: {
 										Type:         schema.TypeString,
 										Optional:     true,
-										ValidateFunc: verify.ValidARN,
+										ValidateFunc: verify.ValidKMSKeyID,
 									},
 									names.AttrSnapshotID: {
 										Type:     schema.TypeString,