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/plugins/manager/pipeline/initialization/steps.go

@@ -47,7 +47,7 @@ func (b *BackendClientInit) Initialize(ctx context.Context, p *plugins.Plugin) (
 		}
 
 		// this will ensure that the env variables are calculated every time a plugin is started
-		envFunc := func() []string { return b.envVarProvider.Get(ctx, p) }
+		envFunc := func() []string { return b.envVarProvider.PluginEnvVars(ctx, p) }
 
 		if backendClient, err := backendFactory(p.ID, p.Logger(), envFunc); err != nil {
 			return nil, err