Beats Management: Pre-migration cleanup (#69155) (#69485)

* adapt KibanaDatabaseAdapter to use core ES service

* remove unused `exposeStaticDir` method

* create empty KP plugin

* remove unused and broken tests

* delete unused wallaby config file

* delete unused utils

* delete unused d.ts and move formsy definition to new plugin

* fix findNonExistentItems

* remove dead code and useless exports from common package

* delete non migratable test suite + remove unused test adapter

* remove yet another unused adapter

* restore awaits in KibanaDatabaseAdapter
# Conflicts:
#	x-pack/legacy/plugins/beats_management/server/lib/adapters/database/__tests__/kibana.ts
#	x-pack/legacy/plugins/beats_management/server/lib/adapters/framework/integration_tests/kibana.ts

x-pack/legacy/plugins/beats_management/common/config_schemas_translations_map.ts

@@ -7,7 +7,7 @@
 import { i18n } from '@kbn/i18n';
 import { ConfigBlockSchema } from './domain_types';
 
-export const supportedConfigLabelsMap = new Map<string, string>([
+const supportedConfigLabelsMap = new Map<string, string>([
   [
     'filebeatInputConfig.paths.ui.label',
     i18n.translate('xpack.beatsManagement.filebeatInputConfig.pathsLabel', {

x-pack/legacy/plugins/beats_management/common/domain_types.ts

@@ -7,8 +7,6 @@ import * as t from 'io-ts';
 import { configBlockSchemas } from './config_schemas';
 import { DateFromString } from './io_ts_types';
 
-export const OutputTypesArray = ['elasticsearch', 'logstash', 'kafka', 'redis'];
-
 // Here we create the runtime check for a generic, unknown beat config type.
 // We can also pass in optional params to create spacific runtime checks that
 // can be used to validate blocs on the API and UI

x-pack/legacy/plugins/beats_management/common/io_ts_types.ts

@@ -7,7 +7,7 @@
 import * as t from 'io-ts';
 import { isRight } from 'fp-ts/lib/Either';
 
-export class DateFromStringType extends t.Type<Date, string, t.mixed> {
+class DateFromStringType extends t.Type<Date, string, t.mixed> {
   // eslint-disable-next-line
   public readonly _tag: 'DateFromISOStringType' = 'DateFromISOStringType';
   constructor() {

x-pack/legacy/plugins/beats_management/common/return_types.ts

@@ -34,11 +34,6 @@ export interface ReturnTypeBulkCreate<T> extends BaseReturnType {
   }>;
 }
 
-// delete
-export interface ReturnTypeDelete extends BaseReturnType {
-  action: 'deleted';
-}
-
 export interface ReturnTypeBulkDelete extends BaseReturnType {
   results: Array<{
     success: boolean;
@@ -84,12 +79,6 @@ export interface ReturnTypeBulkGet<T> extends BaseReturnType {
   items: T[];
 }
 
-// action -- e.g. validate config block. Like ES simulate endpoint
-export interface ReturnTypeAction extends BaseReturnType {
-  result: {
-    [key: string]: any;
-  };
-}
 // e.g.
 // {
 //   result: {