update: Update resource description length limit

Created by: leoendless

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

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes

#https://github.com/kubesphere/kubesphere/issues/2443 #https://github.com/kubesphere/kubesphere/issues/2445

Special notes for reviewers:

Additional documentation, usage docs, etc.: