Plugins: Use suffix for plugin directory (#71375)

* plugin dir suffix

* fix whitespace

* fix cli

* fix tests

* fixup

* simplify

* undo uninstall changes

pkg/plugins/manager/loader/finder/local.go

@@ -28,15 +28,15 @@ type Local struct {
 	production bool
 }
 
-func NewLocalFinder(cfg *config.Cfg) *Local {
+func NewLocalFinder(devMode bool) *Local {
 	return &Local{
-		production: !cfg.DevMode,
+		production: !devMode,
 		log:        log.New("local.finder"),
 	}
 }
 
 func ProvideLocalFinder(cfg *config.Cfg) *Local {
-	return NewLocalFinder(cfg)
+	return NewLocalFinder(cfg.DevMode)
 }
 
 func (l *Local) Find(ctx context.Context, src plugins.PluginSource) ([]*plugins.FoundBundle, error) {