feature/linuxdnsfight: move inotify watching of /etc/resolv.conf out to a feature

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tsnet apps in particular never use the Linux DNS OSManagers, so they don't need
DBus, etc. I started to pull that all out into separate features so tsnet doesn't
need to bring in DBus, but hit this first.

Here you can see that tsnet (and the k8s-operator) no longer pulls in inotify.

Updates #17206

Change-Id: I7af0f391f60c5e7dbeed7a080346f83262346591
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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