fix keyboard nav on settings page

[aalves08]

Summary

Fixes #12787

Occurred changes and/or fixed issues

• fix keyboard nav on settings list page
• settings edit page

Technical notes summary

NOTE: edit setting action menu on each setting will be fixed by #13019

• improved show/hide settings list template because it was reliant on a v-if and rendered 2 different buttons that essentially worked as toggle
• needed to tweak the masthead component so that the focus-visible CSS state for the title link is actually visible for the user
• also verified that Projects with long Display Names do not get truncated #9790 did not regress

Areas or cases that should be tested

Areas which could experience regressions

Screenshot/Video

Checklist

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[rak-phillip]

Looks good. We're obviously missing a lot of benefit that we would get from the Dropdown Menu component.