[surveys] Make survey link accessible
[surveys] Make survey link accessible

Set the role, make the disabled state available via ARIA, conditionally
set the tabIndex for the disabled state too. Add a keydown handler so
that enter + space activate the link.

Bug: 1112738
Change-Id: I914bdf51eb48e9c1b269e8dbe74af71bf99a6ded
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2544763
Commit-Queue: Peter Marshall <6d0eecbeb7fb9d172f49b4b32481d2466fd89429@chromium.org>
Reviewed-by: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>

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