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/api.json

@@ -2663,6 +2663,9 @@
      "type": "string"
     },
     "uid": {
+     "maxLength": 40,
+     "minLength": 1,
+     "pattern": "^[a-zA-Z0-9-_]+$",
      "type": "string"
     },
     "updated": {

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

pkg/services/ngalert/api/tooling/post.json

@@ -764,6 +764,9 @@
     "uid": {
      "description": "UID is the unique identifier of the contact point. The UID can be\nset by the user.",
      "example": "my_external_reference",
+     "maxLength": 40,
+     "minLength": 1,
+     "pattern": "^[a-zA-Z0-9\\-\\_]+$",
      "type": "string"
     }
    },
@@ -2663,6 +2666,9 @@
      "type": "string"
     },
     "uid": {
+     "maxLength": 40,
+     "minLength": 1,
+     "pattern": "^[a-zA-Z0-9-_]+$",
      "type": "string"
     },
     "updated": {

pkg/services/ngalert/api/tooling/spec.json

@@ -3625,6 +3625,9 @@
         "uid": {
           "description": "UID is the unique identifier of the contact point. The UID can be\nset by the user.",
           "type": "string",
+          "maxLength": 40,
+          "minLength": 1,
+          "pattern": "^[a-zA-Z0-9\\-\\_]+$",
           "example": "my_external_reference"
         }
       }
@@ -5534,7 +5537,10 @@
           "example": "Always firing"
         },
         "uid": {
-          "type": "string"
+          "type": "string",
+          "maxLength": 40,
+          "minLength": 1,
+          "pattern": "^[a-zA-Z0-9-_]+$"
         },
         "updated": {
           "type": "string",