Force dismiss of cluster loading message upon cluster creation and change current region to the one of the created cluster

Description

Manually tested on local environment
- Dry-run both successful and unsuccessful: verified that flashbar message is dismissed
- Create successful: verified that flashbar message is not automatically dismissed and selected region is changed before redirect
- Create unsuccessful: verified that flashbar message is dismissed

[ ] I added tests to new or existing code
[ ] I removed hardcoded strings and used react-i18next library (useTranslation hook and/or Trans component), see an example here
[ ] I made sure no sensitive info gets logged at any time in the codebase (see here) (e.g. no user info or details, no stacktraces, etc.)
[x] I made sure that any GitHub issue solved by this PR is correctly linked
[ ] I checked that infrastructure/update_infrastructure.sh runs without any error
[ ] I checked that npm run build builds without any error
[x] I checked that clusters are listed correctly
[x] I checked that a new cluster can be created (config is produced and dry run passes)
[ ] I checked that login and logout work as expected

In order to increase the likelihood of your contribution being accepted, please make sure you have read both the Contributing Guidelines and the Project Guidelines

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.