Plugins: Make it possible to support multiple plugin versions (#82116)

* first pass

* use version in more places

* add comment

* update installer

* fix wire

* fix tests

* tidy

* simplify changes

* fix in mem

* remove unused step

* fix step dupe logic for child plugins + add tests

pkg/plugins/manager/pipeline/termination/steps.go

@@ -54,7 +54,7 @@ func newDeregister(pluginRegistry registry.Service) *Deregister {
 
 // Deregister removes a plugin from the plugin registry.
 func (d *Deregister) Deregister(ctx context.Context, p *plugins.Plugin) error {
-	if err := d.pluginRegistry.Remove(ctx, p.ID); err != nil {
+	if err := d.pluginRegistry.Remove(ctx, p.ID, p.Info.Version); err != nil {
 		return err
 	}
 	d.log.Debug("Plugin unregistered", "pluginId", p.ID)