Add 'Cancel all imports' button and confirmation dialog when importing projects from GitHub

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The following discussion from !103934 (merged) should be addressed:

• @xanf started a discussion: (+5 comments)

  @gdoyle could you please give us a hand with UX review?

non-blocking: The design included a Cancel imports button when you bulk import many projects. I didn't see that appear on the screen. Will this be done in a follow-up?

Proposal

• Add Cancel all button based on this design.
• Add a confirmation modal when taking this action with the following text 👇

Cancel remaining imports?

6 repositories are still importing. Imported files will be kept. You can reimport these repositories again later.

Continue importing Cancel remaining imports

Technical Writing review: !103934 (comment 1211554229)