Add "Delete request" button to the "Multiple selection buttons" block

[tvami]

Is your feature related to a problem?

Many buttons that are available for an individual request are available under the "Multiple selection buttons" block, but not the "Delete request" button. In case we accidentally requests to the wrong campaign for example, and create O(100) requests it's a pain to delete them one by one.

Describe the solution you'd like

Add "Delete request" button to the "Multiple selection buttons" block. The "Delete request" only works on requests that are "New" so it's not going to lead to unintended behavior.

Current behavior

We have to click O(100) times for the example above

Expected behavior

Adding this button to the bottom block will allow us to delete the mistakenly added requests.

Tagging @ggonzr @DickyChant