chore(identitytoolkit): onboard apiv2 (#9786)

Updates: #3163
diff --git a/.github/.OwlBot.yaml b/.github/.OwlBot.yaml
index 6db952f..a8979fb 100644
--- a/.github/.OwlBot.yaml
+++ b/.github/.OwlBot.yaml
@@ -133,6 +133,7 @@
   - /iam/apiv2/
   - /iam/credentials/apiv1/
   - /iap/apiv1/
+  - /identitytoolkit/apiv2/
   - /ids/apiv1/
   # START snippets
   - /internal/generated/snippets/accessapproval/apiv1/
@@ -262,6 +263,7 @@
   - /internal/generated/snippets/iam/apiv2/
   - /internal/generated/snippets/iam/credentials/apiv1/
   - /internal/generated/snippets/iap/apiv1/
+  - /internal/generated/snippets/identitytoolkit/apiv2/
   - /internal/generated/snippets/ids/apiv1/
   - /internal/generated/snippets/iot/apiv1/
   - /internal/generated/snippets/kms/apiv1/
@@ -841,6 +843,8 @@
     dest: /
   - source: /google/cloud/iap/v1/cloud.google.com/go
     dest: /
+  - source: /google/cloud/identitytoolkit/v2/cloud.google.com/go
+    dest: /
   - source: /google/cloud/ids/v1/cloud.google.com/go
     dest: /
   - source: /google/cloud/iot/v1/cloud.google.com/go
diff --git a/internal/postprocessor/config.yaml b/internal/postprocessor/config.yaml
index c0880ac..d462662 100644
--- a/internal/postprocessor/config.yaml
+++ b/internal/postprocessor/config.yaml
@@ -74,6 +74,7 @@
   - gsuiteaddons
   - iam
   - iap
+  - identitytoolkit
   - ids
   - iot
   - kms
@@ -605,6 +606,9 @@
   - input-directory: google/cloud/iap/v1
     service-config: iap_v1.yaml
     import-path: cloud.google.com/go/iap/apiv1
+  - input-directory: google/cloud/identitytoolkit/v2
+    service-config: identitytoolkit_v2.yaml
+    import-path: cloud.google.com/go/identitytoolkit/apiv2
   - input-directory: google/cloud/ids/v1
     service-config: ids_v1.yaml
     import-path: cloud.google.com/go/ids/apiv1