Server: Switch from separate server & cli to a unified grafana binary (#58286)

* avoid the need for a second bulky binary for grafana-cli

* look for grafana-server in $PATH as well as same directory

* implement unified "grafana" command

* update dockerfiles, fix grafana-cli -v

* update packaging to work with single binary

- add wrapper scripts for grafana and grafana-server
- update and sync package files
- implement --sign flag of build package command
- stop packaging scripts folder, they are not useful for end users
- add support for --configOverrides in server command
- remove unused nfpm.yaml config file

* windows support

packaging/mac/bin/grafana

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 DAEMON=grafana-server
-EXECUTABLE=/usr/local/bin/grafana-server
+EXECUTABLE=/usr/share/grafana/bin/grafana
 CONFIG=/usr/local/etc/grafana/grafana.ini
 HOMEPATH=/usr/local/share/grafana
 LOGPATH=/usr/local/var/log/grafana
@@ -11,7 +11,7 @@ DASHBOARDSCFGPATH=/usr/local/etc/grafana/dashboards
 
 case "$1" in
 start)
-  $EXECUTABLE --config=$CONFIG --homepath=$HOMEPATH cfg:default.paths.datasources=$DATASOURCECFGPATH cfg:default.paths.dashboards=$DASHBOARDSCFGPATH cfg:default.paths.logs=$LOGPATH cfg:default.paths.data=$DATAPATH cfg:default.paths.plugins=$PLUGINPATH 2> /dev/null &
+  $EXECUTABLE server --config=$CONFIG --homepath=$HOMEPATH cfg:default.paths.datasources=$DATASOURCECFGPATH cfg:default.paths.dashboards=$DASHBOARDSCFGPATH cfg:default.paths.logs=$LOGPATH cfg:default.paths.data=$DATAPATH cfg:default.paths.plugins=$PLUGINPATH 2> /dev/null &
   [ $? -eq 0 ] && echo "$DAEMON started"
 ;;
 stop)