gnugmanov SNOW 2334154 sanssh clean output

[sfc-gh-gnugmanov]

Add --clean-output to strip prefixed metadata from output lines
Add newline-aware cleaner GetCleanOutputWriter in services/util/writer
that removes everything up to the first space on each line
Wire cleaner into cmd/sanssh/client/client.go; apply cleaning before
optional prefixing (-h) so sanssh’s prefix remains intact
Add --clean-output flag in cmd/sanssh/main.go and pass via RunState
Mark --clean-output as important so it appears in sanssh help
Update examples/docs to reflect ${random-number}-${ip}:9500: prefix
format (dash between number and IP)
Add TestCleanWriter and keep existing writer tests passing
Usage:
./sanssh --targets=host1 --clean-output file read /var/log/app.log
Behavior:
"123-10.0.0.1:9500: some_output_strings" -> "some_output_strings"