Plugins: Refactor plugin config into separate env var and request scoped services (#83261)

* seperate services for env + req

* merge with main

* fix tests

* undo changes to golden file

* fix linter

* remove unused fields

* split out new config struct

* provide config

* undo go mod changes

* more renaming

* fix tests

* undo bra.toml changes

* update go.work.sum

* undo changes

* trigger

* apply PR feedback

pkg/services/pluginsintegration/pluginconfig/fakes.go

@@ -0,0 +1,16 @@
+package pluginconfig
+
+import "context"
+
+var _ PluginRequestConfigProvider = (*FakePluginRequestConfigProvider)(nil)
+
+type FakePluginRequestConfigProvider struct{}
+
+func NewFakePluginRequestConfigProvider() *FakePluginRequestConfigProvider {
+	return &FakePluginRequestConfigProvider{}
+}
+
+// PluginRequestConfig returns a map of configuration that should be passed in a plugin request.
+func (s *FakePluginRequestConfigProvider) PluginRequestConfig(ctx context.Context, pluginID string) map[string]string {
+	return map[string]string{}
+}