fix: onPaste separator logic in KeyValue.vue

[a110605]

Summary

In Images -> Create -> Labels, follow the tooltip Paste lines of key=value or key:value into any key field for easy bulk entry and try to paste key=value lines, but not convert to lables automatically.

PR Checklist

• Is this a multi-tenancy feature/bug?
  • Yes, the relevant RBAC changes are at:
• Do we need to backport changes to the old Rancher UI, such as RKE1?
  • Yes, the relevant PR is at:
• Are backend engineers aware of UI changes?
  • Yes, the backend owner is:

Fixes # harvester/harvester#4206

Technical notes summary

KeyValue.vue natively have onPaste logic l to convert multi-lines into key:value map.
But have error logic to support : separator.

Screenshot/Video

Check this change also fix

• Virtual Machine -> Create ✅
• Network -> Load Balancer -> Create ✅
• Image -> Create ✅

e.g. paste in key field

user-firstname=Andy Lee 
user-lastname=aaa
user-id:123

[torchiaf]

LGTM

[torchiaf]

@a110605 Could you please open a new issue for porting in Rancher dashboard ?

[a110605]

@a110605 Could you please open a new issue for porting in Rancher dashboard ?

Opened in rancher/dashboard : rancher#10958