Update some Djblets components to use the new spinner.

Review Request #11035 — Created May 21, 2020 and updated

chipx86
Djblets
release-2.0.x
djblets

This updates both the config forms ListItemView and the integrations
page to utilize the new djblets-o-spinner component, and to make use
of ARIA attributes to hint to screen readers that some areas of the page
are loading.

This just leaves the extensions page left using the old spinner, but
that's intentional, as that's being completely rewritten separately.

Verified that the attributes were set correctly whenever the spinner
was shown for list items, and that the integrations page had the correct
attributes and spinner as well.

Summary
Update some Djblets components to use the new spinner.
Checks run (2 succeeded)
flake8 passed.
JSHint passed.
david
  1. Ship It!
  2. 
      
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