chore(#2085): remove ike-prow-plugin configuration file test-keeper.y(a)ml

[dipak-pawar]

Fixes: #2085

Depends on #arquillian/ike-prow-plugins#144

[centos-ci]

Can one of the admins verify this patch?

[centos-ci]

Can one of the admins verify this patch?

[alien-ike]

Ike Plugins (test-keeper)

Thank you @dipak-pawar for this contribution!

It appears that no tests have been added or updated in this PR.

Automated tests give us confidence in shipping reliable software. Please add some as part of this change.

If you are an admin or the reviewer of this PR and you are sure that no test is needed then you can use the command /ok-without-tests as a comment to make the status green.

For more information please head over to official documentation. You can find there how to configure the plugin - for example exclude certain file types so if PR contains only them it won't be checked.

[MatousJobanek]

The referenced issue has been already merged and deployed to the new Ike plugins instance. So I think that this PR is ready to merge