Merge branch 'feature/18252-tor-browser-10.0.15+force-all-tests' into 'stable'

Upgrade Tor Browser to 10.0.15

Closes #18252

See merge request tails/tails!399

config/chroot_local-includes/usr/share/tails/tbb-dist-url.txt

-http://people.torproject.org/~sysrqb/builds/10.0.14-build1/
+http://torbrowser-archive.tails.boum.org/10.0.15/

config/chroot_local-includes/usr/share/tails/tbb-sha256sums.txt

-a273505efa1f62361a859183325cfc7f38defc3348c755c85c138ba5b76a928f  tor-browser-linux64-10.0.14_en-US.tar.xz
-d9c410c436b670123194fe9e4887306ea765988e500e110b6a0d8e3a4c39eb49  langpacks-tor-browser-linux64-10.0.14.tar.xz
+3a73b44f68fe97c4d89984fd0a23be069c495ada7ecf97dc3060c6e7aa4c06aa  tor-browser-linux64-10.0.15_en-US.tar.xz
+d9c410c436b670123194fe9e4887306ea765988e500e110b6a0d8e3a4c39eb49  langpacks-tor-browser-linux64-10.0.15.tar.xz