UX for removing cluster integration is clunky

Summary

When attempting to remove a cluster integration the UX was clunky.

Steps to reproduce

Attempt to remove any existing cluster integration

Example Project

I removed my cluster so I don't have a use case

What is the current bug behavior?

When you select whether you want to remove the integration or remove the integration and resources and then click the red action button it gives you a modal for confirming but that model is styled differently than our other confirmation modals. Further the modal still gives you the option for removing either just the integration or the integration and the resources. Clicking integration and resources didn't appear to do anything.

What is the expected correct behavior?

(What you should see instead)

Relevant logs and/or screenshots

Output of checks

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Results of GitLab environment info

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`sudo gitlab-rake gitlab:env:info`)

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`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

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sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)