…cherry-pick #18647) (#18649)

Co-authored-by: dependabot[bot]
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

…ick #18673) (#18676)

Cherry-picked fix: stop tearing down non-TTY processes on SSH session
end (#18673)

(possibly temporary) fix for #18519

Matches OpenSSH for non-tty sessions, where we don't actively terminate
the process.

Adds explicit tracking to the SSH server for these processes so that if
we are shutting down we terminate them: this ensures that we can shut
down quickly to allow shutdown scripts to run. It also ensures our tests
don't leak system resources.

Co-authored-by: Spike Curtis <[email protected]>

…ry-pick #18680) (#18697)

Co-authored-by: Claude <[email protected]>
Co-authored-by: Garrett Delfosse <[email protected]>

Co-authored-by: Danny Kopping <[email protected]>
Co-authored-by: Steven Masley <[email protected]>
Co-authored-by: Bruno Quaresma <[email protected]>
Co-authored-by: Sas Swart <[email protected]>
Co-authored-by: Susana Ferreira <[email protected]>
Co-authored-by: Danielle Maywood <[email protected]>
Co-authored-by: Mathias Fredriksson <[email protected]>
Co-authored-by: Copilot <[email protected]>
Co-authored-by: Asher <[email protected]>
Co-authored-by: Hugo Dutka <[email protected]>

…pick #18723) (#18724)

Co-authored-by: Hugo Dutka <[email protected]>

…pick #18687) (#18726)

Co-authored-by: Hugo Dutka <[email protected]>

Cherry-picked chore: add rdp icon (#18736)

Co-authored-by: Atif Ali <[email protected]>