[Deprecation] Deprecated - AWS Root Login Without MFA (#5351)

Completing Deprecation Process for this rule. It has now been included in our ruleset with `Deprecated -` prefix for 2 release cycles and should now be moved to our `_deprecated` folder.

(cherry picked from commit 497642d)

Author: imays11

…e_escalation_root_login_without_mfa.toml …e_escalation_root_login_without_mfa.tomlrules/integrations/aws/privilege_escalation_root_login_without_mfa.toml renamed to rules/_deprecated/privilege_escalation_root_login_without_mfa.toml rules/integrations/aws/privilege_escalation_root_login_without_mfa.toml renamed to rules/_deprecated/privilege_escalation_root_login_without_mfa.toml

@@ -1,8 +1,9 @@
 [metadata]
 creation_date = "2020/07/06"
 integration = ["aws"]
-maturity = "production"
-updated_date = "2025/10/10"
+deprecation_date = "2025/11/21"
+maturity = "deprecated"
+updated_date = "2025/11/21"
 
 [rule]
 author = ["Elastic"]