CI: Support more version formats in publishing (#94575)
* cleanup dead code
* add tests and rewrite publish grafanacom steps to reuse
* add pkg/build tests; don't upload CDN assets on grafana releases
(cherry picked from commit 7a2edd35d5)
* 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