[Ingest] Data source APIs (#52448)

* Clean up ingest imports and remove unneeded mock_spec files

* Initial pass at datasources lib and API endpoints

* Add add/remove datasource to/from policy API endpoints

* Add datasource contract tests and related policy contract tests; update snapshots

* Fix tests

* Fix tests again

* Fix tests 3

* Adjust routes, PR feedback

x-pack/legacy/plugins/fleet/common/types/domain_data.ts

@@ -4,7 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 import * as t from 'io-ts';
-export { Policy, Datasource } from '../../../ingest/server/libs/types';
+export { Policy, Datasource, Status, Output } from '../../../ingest/server/libs/types';
 import { RuntimeAgent, RuntimeAgentAction } from '../../server/repositories/agents/types';
 import { RuntimeAgentEvent } from '../../server/repositories/agent_events/types';
 export { EnrollmentApiKey } from '../../server/repositories/enrollment_api_keys/types';

x-pack/legacy/plugins/fleet/public/lib/adapters/policy/rest_policy_adapter.ts

@@ -22,7 +22,7 @@ export class RestPolicyAdapter extends PolicyAdapter {
 
   public async get(id: string): Promise<Policy | null> {
     try {
-      return (await this.REST.get<ReturnTypeGet<Policy>>(`/api/ingest/policy/${id}`)).item;
+      return (await this.REST.get<ReturnTypeGet<Policy>>(`/api/ingest/policies/${id}`)).item;
     } catch (e) {
       return null;
     }
@@ -51,7 +51,7 @@ export class RestPolicyAdapter extends PolicyAdapter {
   }
 
   public async update(id: string, policy: Partial<Policy>) {
-    return await this.REST.put<ReturnTypeUpdate<Policy>>(`/api/ingest/policy/${id}`, policy);
+    return await this.REST.put<ReturnTypeUpdate<Policy>>(`/api/ingest/policies/${id}`, policy);
   }
 
   public async getAgentStatus(policyId: string) {

x-pack/legacy/plugins/fleet/public/pages/agent_list/components/agent_enrollment.tsx

@@ -23,6 +23,7 @@ import {
 } from '@elastic/eui';
 import { FormattedMessage } from '@kbn/i18n/react';
 import React, { Fragment, useState } from 'react';
+import { Policy } from '../../../../common/types/domain_data';
 import { useLibs } from '../../../hooks/use_libs';
 import { EnrollmentApiKeysTable } from './enrollment_api_keys';
 import { useEnrollmentApiKey, useEnrollmentApiKeys } from './enrollment_api_keys/hooks';
@@ -31,7 +32,6 @@ import {
   ShellEnrollmentInstructions,
   ToolsEnrollmentInstructions,
 } from './enrollment_instructions';
-import { Policy } from '../../../../../ingest/server/libs/types';
 
 interface RouterProps {
   onClose: () => void;