fix: Block users from submitting updates when gateway configuration verification fails

Created by: weili520

Signed-off-by: TheYoungManLi cjl@kubesphere.io

What type of PR is this?

/kind bug

What this PR does / why we need it:

During updating gateway, if the user sets configurations for the gateway and validates failure, the user can't save it. Until then, we did not limit it.

Which issue(s) this PR fixes:

Part of the work of ##2431 (closed)

Special notes for reviewers:

Does this PR introduced a user-facing change?

Block users from submitting updates when gateway configuration verification fails