Do not use page transition for purge command

[fredg02]

See https://issues.jenkins.io/browse/JENKINS-21674

Copying the behavior from project -> Delete project. Use also the better
fitting 'edit-delete.svgicon instead of thegear.svg` icon.

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[fredg02]

Thanks for the review. I'll fix this.

[fredg02]

I have not found a way to make the action work with MANAGE permissions yet, so I've set all the checks to ADMINISTER explicitly to avoid confusion.

[NotMyFault]

Thanks for your contribution, looks great so far!

[fredg02]

Thanks for the fast turn-around.👍