Alerting: Update provisioning to validate user-defined UID on create (#73793)

* add ValidateUID to util
* provisioning to validate UID on rule creation

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Co-authored-by: brendamuir <100768211+brendamuir@users.noreply.github.com>
Co-authored-by: Alexander Weaver <weaver.alex.d@gmail.com>

docs/sources/alerting/set-up/provision-alerting-resources/file-provisioning/index.md

@@ -65,7 +65,7 @@ groups:
     interval: 60s
     # <list, required> list of rules that are part of the rule group
     rules:
-      # <string, required> unique identifier for the rule
+      # <string, required> unique identifier for the rule. Should not exceed 40 symbols. Only letters, numbers, - (hyphen), and _ (underscore) allowed.
       - uid: my_id_1
         # <string, required> title of the rule that will be displayed in the UI
         title: my_first_rule
@@ -158,7 +158,7 @@ contactPoints:
     # <string, required> name of the contact point
     name: cp_1
     receivers:
-      # <string, required> unique identifier for the receiver
+      # <string, required> unique identifier for the receiver. Should not exceed 40 symbols. Only letters, numbers, - (hyphen), and _ (underscore) allowed.
       - uid: first_uid
         # <string, required> type of the receiver
         type: prometheus-alertmanager