Removes older configuration that is no longer in use, removes un-used configuration keys (#104540)

## Summary

* Removes `kibana.yml` (configuration) keys that are not in use 
* Removes an older configuration schema file from before the merge of endpoint with security solutions

Unused schema file was:
```
server/endpoint/config.ts
```

Unused keys removed:

```
xpack.securitySolution.alertResultListDefaultDateRange
xpack.securitySolution.validateArtifactDownloads
```

### Checklist

- [x] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios

src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker

@@ -381,7 +381,6 @@ kibana_vars=(
     xpack.security.session.lifespan
     xpack.security.sessionTimeout
     xpack.securitySolution.alertMergeStrategy
-    xpack.securitySolution.alertResultListDefaultDateRange
     xpack.securitySolution.endpointResultListDefaultFirstPageIndex
     xpack.securitySolution.endpointResultListDefaultPageSize
     xpack.securitySolution.maxRuleImportExportSize
@@ -389,7 +388,6 @@ kibana_vars=(
     xpack.securitySolution.maxTimelineImportExportSize
     xpack.securitySolution.maxTimelineImportPayloadBytes
     xpack.securitySolution.packagerTaskInterval
-    xpack.securitySolution.validateArtifactDownloads
     xpack.spaces.enabled
     xpack.spaces.maxSpaces
     xpack.task_manager.enabled

x-pack/plugins/security_solution/server/config.ts

@@ -60,19 +60,10 @@ export const configSchema = schema.object({
   endpointResultListDefaultFirstPageIndex: schema.number({ defaultValue: 0 }),
   endpointResultListDefaultPageSize: schema.number({ defaultValue: 10 }),
 
-  /**
-   * Alert Endpoint Configuration
-   */
-  alertResultListDefaultDateRange: schema.object({
-    from: schema.string({ defaultValue: 'now-15m' }),
-    to: schema.string({ defaultValue: 'now' }),
-  }),
-
   /**
    * Artifacts Configuration
    */
   packagerTaskInterval: schema.string({ defaultValue: '60s' }),
-  validateArtifactDownloads: schema.boolean({ defaultValue: true }),
 });
 
 export const createConfig = (context: PluginInitializerContext) =>

x-pack/plugins/security_solution/server/endpoint/config.test.ts

@@ -1,17 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the Elastic License
- * 2.0; you may not use this file except in compliance with the Elastic License
- * 2.0.
- */
-
-import { EndpointConfigSchema, EndpointConfigType } from './config';
-
-describe('test config schema', () => {
-  it('test config defaults', () => {
-    const config: EndpointConfigType = EndpointConfigSchema.validate({});
-    expect(config.enabled).toEqual(false);
-    expect(config.endpointResultListDefaultPageSize).toEqual(10);
-    expect(config.endpointResultListDefaultFirstPageIndex).toEqual(0);
-  });
-});

x-pack/plugins/security_solution/server/endpoint/config.ts

@@ -1,42 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the Elastic License
- * 2.0; you may not use this file except in compliance with the Elastic License
- * 2.0.
- */
-
-import { schema, TypeOf } from '@kbn/config-schema';
-import { Observable } from 'rxjs';
-import { PluginInitializerContext } from 'kibana/server';
-
-export type EndpointConfigType = ReturnType<typeof createConfig$> extends Observable<infer P>
-  ? P
-  : ReturnType<typeof createConfig$>;
-
-export const EndpointConfigSchema = schema.object({
-  enabled: schema.boolean({ defaultValue: false }),
-
-  /**
-   * Host Configuration
-   */
-  endpointResultListDefaultFirstPageIndex: schema.number({ defaultValue: 0 }),
-  endpointResultListDefaultPageSize: schema.number({ defaultValue: 10 }),
-
-  /**
-   * Alert Configuration
-   */
-  alertResultListDefaultDateRange: schema.object({
-    from: schema.string({ defaultValue: 'now-15m' }),
-    to: schema.string({ defaultValue: 'now' }),
-  }),
-
-  /**
-   * Artifacts Configuration
-   */
-  packagerTaskInterval: schema.string({ defaultValue: '60s' }),
-  validateArtifactDownloads: schema.boolean({ defaultValue: true }),
-});
-
-export function createConfig$(context: PluginInitializerContext) {
-  return context.config.create<TypeOf<typeof EndpointConfigSchema>>();
-}

x-pack/plugins/security_solution/server/lib/detection_engine/routes/__mocks__/index.ts

@@ -24,12 +24,7 @@ export const createMockConfig = (): ConfigType => ({
   enableExperimental: [],
   endpointResultListDefaultFirstPageIndex: 0,
   endpointResultListDefaultPageSize: 10,
-  alertResultListDefaultDateRange: {
-    from: 'now-15m',
-    to: 'now',
-  },
   packagerTaskInterval: '60s',
-  validateArtifactDownloads: true,
   alertMergeStrategy: 'missingFields',
 });