feat: create extensionVersions by depth (#6286)

* feat: create extensionVersions by depth

* Apply suggestions from code review

Signed-off-by: hongming <coder.scala@gmail.com>

* Apply suggestions from code review

Signed-off-by: hongming <coder.scala@gmail.com>

---------

Signed-off-by: hongming <coder.scala@gmail.com>
Co-authored-by: joyceliu <joyceliu@yunify.com>
Co-authored-by: hongming <coder.scala@gmail.com>

config/ks-core/charts/ks-crds/crds/kubesphere.io_repositories.yaml

@@ -53,6 +53,10 @@ spec:
                 description: The caBundle (base64 string) is used in helmExecutor
                   to verify the helm server.
                 type: string
+              depth:
+                description: The number of synchronized versions of each extension.
+                  0 means synchronized all versions, default is 3.
+                type: integer
               description:
                 type: string
               image: