Correlations: Add organization id (#72258)

* Add org_id to correlations

* Add tests

* Allow org_id to be null in case org_id=0 is used

* Create organization to ensure stable id is generated

* Fix linting

* Ensure backwards compatibility

* Add deprecation information

* Migrate correlations indices

* Default org_id when migrating

* Remove redundant default

* Make PK non-nullable

pkg/services/provisioning/datasources/testdata/correlations-different-organizations/org-1.yaml

@@ -0,0 +1,6 @@
+apiVersion: 1
+
+datasources:
+  - name: Foo
+    orgId: 1
+    type: graphite

pkg/services/provisioning/datasources/testdata/correlations-different-organizations/org-2.yaml

@@ -0,0 +1,15 @@
+apiVersion: 1
+
+deleteDatasources:
+  - name: Foo
+    orgId: 2
+
+datasources:
+  - name: Foo
+    uid: foo
+    orgId: 2
+    type: graphite
+    correlations:
+      - targetUID: foo
+        label: self correlation
+        description: a description

pkg/services/provisioning/datasources/testdata/correlations-different-organizations/org-3.yaml

@@ -0,0 +1,11 @@
+apiVersion: 1
+
+datasources:
+  - name: Foo
+    uid: foo
+    orgId: 3
+    type: graphite
+    correlations:
+      - targetUID: foo
+        label: self correlation
+        description: a description