refactor: standardize command naming

This standardization makes it somewhat easier to read stacktraces as the command names are all uniform, so it will be slightly easier to scan trace output.

plugins/git/subcommands/set

@@ -4,7 +4,7 @@ source "$PLUGIN_CORE_AVAILABLE_PATH/common/property-functions"
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
 
-git-set-cmd() {
+cmd-git-set() {
   declare desc="set or clear a git property for an app"
   local cmd="git:set" argv=("$@")
   [[ ${argv[0]} == "$cmd" ]] && shift 1
@@ -33,4 +33,4 @@ git-set-cmd() {
   fi
 }
 
-git-set-cmd "$@"
+cmd-git-set "$@"