fix: Modify the validation rules of imageName on S2I page

Created by: fuchunlan

Signed-off-by: lannyfu lannyfu@yunify.com

What type of PR is this? /kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes ##1952 (closed)

Special notes for reviewers:

Additional documentation, usage docs, etc.: