ci(create-backport-branch.yml): add workflow_dispatch trigger

.github/workflows/create-backport-branch.yml

@@ -1,6 +1,21 @@
 name: Create Backport Branch
 
 on:
+  workflow_dispatch:
+    inputs:
+      last_release_version:
+        description: 'The version of the last release. Example: 1.2.3'
+        required: true
+        type: string
+      new_release_version:
+        description: 'The version of the new release. Example: 1.3.0'
+        required: true
+        type: string
+      last_release_git_tag:
+        description: 'The git tag of the last release. Defaults to `v{last_release_version}`. Example: v1.2.3'
+        required: false
+        default: ''
+        type: string
   workflow_call:
     inputs:
       last_release_version: