Add a Configure option to overflow menu of Open Editors view

[gjsjohnmurray]

This implements an idea proposed in #237619.

[gjsjohnmurray]

/assign @benibenj

I am enumerating all 3 settings in the call to Settings Editor because a simpler filter on explorer.openEditors returns some unrelated matches.

[gjsjohnmurray]

Just discovered that @feature:explorer openEditors would achieve the matches I want, and might be more future-proof. What do you think?

[gjsjohnmurray]

For future consideration we could add a similar option to the Outline view's overflow menu, using @feature:explorer outline as the settings search value.

Similarly for Timeline view, where timeline. seems to isolate the relevant settings.

[benibenj]

Nice find with @feature:explorer openEditors, let's use that. Enumerating the setting IDs will be annoying to maintain

[gjsjohnmurray]

Done.

[benibenj]

Thanks!