Plugins: Refactor plugin download/installation (#43046)

* installer -> repo

* add semver format checking

* add plugin callbacks in test

* remove newline

* post install only scans new directories

* remove unused stuff

* everything in own package

* add missing cli params

* make grafana version part of the API

* resolve conflicts

* tidy up logger

* fix cli and tidy log statements

* rename log package

* update struct name

* fix linter issue

* fs -> filestore

* reorder imports

* alias import

* fix test

* fix test

* inline var

* revert jsonc file

* make repo dep of manager

* actually inject the thing

* accept all args for compatability checks

* accept compat from store

* pass os + arch vals

* don't inject fs

* tidy up

* tidy up

* merge with main and tidy fs storage

* fix test

* fix packages

* fix comment + field name

* update fs naming

* fixed wire

* remove unused func

* fix mocks

* fix storage test

* renaming

* fix log line

* fix test

* re-order field

* tidying

* add test for update with same version

* fix wire for CLI

* remove use of ioutil

* don't pass field

* small tidy

* ignore code scanning warn

* fix testdata link

* update lgtm code

pkg/cmd/grafana-cli/commands/upgrade_command.go

@@ -1,6 +1,7 @@
 package commands
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/fatih/color"
@@ -29,7 +30,7 @@ func (cmd Command) upgradeCommand(c utils.CommandLine) error {
 			return fmt.Errorf("failed to remove plugin '%s': %w", pluginName, err)
 		}
 
-		return InstallPlugin(pluginName, "", c)
+		return installPlugin(context.Background(), pluginName, "", c)
 	}
 
 	logger.Infof("%s %s is up to date \n", color.GreenString("✔"), pluginName)