fix: Add environment variables validation and tips

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:

Which issue(s) this PR fixes:

Fixes ##2790 (closed)

Special notes for reviewers:

https://user-images.githubusercontent.com/33231138/146139315-cd82dfd5-a89f-4066-8026-ad99c2ebadfd.mov

Does this PR introduced a user-facing change?

Add environment variables validation and error prompt in the container edit page.

Additional documentation, usage docs, etc.: