Changes:

- moved global redirect toggle from Browser Action menu to the utility
  icon row, under "redirect" icon
- added animation to utility icons
- global redirect icon will enable integrations if clicked when in
  suspended state
- menu items specific to the Active Tab are marked with additional
  border (just a prototype, needs refinement)
- Redirect opt-out per site
  - new menu item in Active Tab section
  - when clicked on regular site toggles redirect for current FQDN and
    all its subdomains
  - when clicked on /ipns/<fqdn>/ (DNSLink) website, toggles redirect for <fqdn>
  - after redirect preference changes for current website, the tab is
    reloaded
  - DNSLink websites are reloaded to with URL change between IPNS path
    and original URL
  - redirect preference applies not only to requests to URLs with with FQDN
    of the active tab, but also to all subresource requests that have it
    in `originUrl` (Firefox) or `Referer` header (Chrome)

Following suggestion from
#687 (comment)

The request for main page (request.type=main_request) is often optimized
early by preloading DNSLink etc.

We switch tests to one of subrequest types to ensure the test is not
impacted by main_test logic.

This removes dotted border and introduces familiar grandient
as sugegsted in
#687 (comment)

This adds a textarea for editing per-site opt-outs.
Array is converted into multi-line text.
Entries that are not valid FQDNs are dropped.
The list is sorted lexicographically.

- removed unused paths from redirect-icon SVG
- small code cleanup

Added ipfsPathValidator.isRedirectPageActionsContext with tests:
Per-site toggle won't be shown on internal pages and non-IPNS urls
loaded from local gateway (confusing to users)

Removed redundant variables in Browser Action context and made UI less
jittery.

It was raised during the review that labels should not change.

This changes the UI of redirect toggles from dynamic label
to static label + @material/switch

We already have it as regular menu item, and the switch glyph seems to
confuse people about its purpose, so let's remove UI cruft and hide the
icon toggle for now.

Another small tweak is to fade out global toggle instead of hiding it
in offline mode, which removes unnecessary jitter from UI.

+ unify labels related to redirects