Chore: Implement gosec (#16261)

See https://github.com/securego/gosec for more info.

Disabled a lot of rules. I guess we should go through them
and recheck if we really need to disable some

Fixes #16204

scripts/backend-lint.sh

@@ -20,6 +20,7 @@ go get -u github.com/mdempsky/unconvert
 go get -u github.com/opennota/check/cmd/varcheck
 go get -u honnef.co/go/tools/cmd/staticcheck
 go get -u github.com/mgechev/revive
+go get -u github.com/securego/gosec/cmd/gosec/...
 
 exit_if_fail gometalinter --enable-gc --vendor --deadline 10m --disable-all \
   --enable=deadcode \
@@ -33,3 +34,6 @@ exit_if_fail gometalinter --enable-gc --vendor --deadline 10m --disable-all \
 
 exit_if_fail go vet ./pkg/...
 exit_if_fail revive -formatter stylish -config ./conf/revive.toml
+
+# TODO recheck the rules and leave only necessary exclusions
+exit_if_fail gosec -quiet -exclude=G104,G107,G201,G202,G204,G301,G302,G304,G402,G501,G505,G401 ./pkg/...