Add ability to cancel rename operation

[RomanNikitenko]

What does this PR do?

• Increase timeout for rename operation from 10 sec to 30 sec

• Add ability to cancel rename operation

• Add loader for 'OK' button to display state when operation is in progress
  

• Fix NPE and provide error message for case when operation is interrupted by timeout:
  Current behavior:
  
  The new behavior:
  

• improve a little process of validation name:
  Current state - we send request per each inputted character
  

The new behavior: while user is typing - we are waiting, when he stopped - we send request to validate new name

What issues does this PR fix or reference?

#10784 #11754

Signed-off-by: Roman Nikitenko rnikiten@redhat.com

[RomanNikitenko]

ci-test

[riuvshin]

Results of automated E2E tests of Eclipse Che Multiuser on OCP:
Build details
Test report
docker image: eclipseche/che-server:11886
https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.

[RomanNikitenko]

ci-test

[riuvshin]

Results of automated E2E tests of Eclipse Che Multiuser on OCP:
Build details
Test report
docker image: eclipseche/che-server:11886
https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.

[RomanNikitenko]

ci-test

[riuvshin]

Results of automated E2E tests of Eclipse Che Multiuser on OCP:
Build details
Test report
docker image: eclipseche/che-server:11886
https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.

[artaleks9]

Selenium tests execution on Eclipse Che Multiuser on OCP (https://ci.codenvycorp.com/job/che-pullrequests-test-ocp/1158/) doesn't show any regression against this Pull Request.