PLT-6965 jira integration (plus plugin scaffolding) (#6918)

* plugin scaffolding / jira integration

* add vendored testify packages

* webhook fix

* don't change i18n ids

* support configuration watching

* add basic jira plugin configuration to admin console

* fix eslint errors

* fix another eslint warning

* polish

* undo unintentional config.json commit >:(

* test fix

* add jira plugin diagnostics, remove dm support, add bot tag, generate web-safe secrets

* rebase, implement requested changes

* requested changes

* remove tests and minimize makefile change

* add missing license headers

* add missing comma

* remove bad line from Makefile

cmd/platform/server.go

@@ -73,6 +73,7 @@ func runServer(configFileLocation string) {
 	wsapi.InitRouter()
 	api4.InitApi(false)
 	api.InitApi()
+	app.InitPlugins()
 	wsapi.InitApi()
 	web.InitWeb()