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

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

---------

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

pkg/services/ngalert/api/tooling/definitions/provisioning_alert_rules.go

@@ -108,7 +108,11 @@ type AlertRuleHeaders struct {
 type ProvisionedAlertRules []ProvisionedAlertRule
 
 type ProvisionedAlertRule struct {
-	ID  int64  `json:"id"`
+	ID int64 `json:"id"`
+	// required: false
+	// minLength: 1
+	// maxLength: 40
+	// pattern: ^[a-zA-Z0-9-_]+$
 	UID string `json:"uid"`
 	// required: true
 	OrgID int64 `json:"orgID"`

pkg/services/ngalert/api/tooling/definitions/provisioning_contactpoints.go

@@ -81,6 +81,10 @@ type ContactPoints []EmbeddedContactPoint
 type EmbeddedContactPoint struct {
 	// UID is the unique identifier of the contact point. The UID can be
 	// set by the user.
+	// required: false
+	// minLength: 1
+	// maxLength: 40
+	// pattern: ^[a-zA-Z0-9\-\_]+$
 	// example: my_external_reference
 	UID string `json:"uid"`
 	// Name is used as grouping key in the UI. Contact points with the