[Security Solution][Detections] - rule query preview bug fix (#80750) (…

…#81196)

### Summary 

This PR addresses the remaining query preview bugs. 

- it adds index, and request information to eql inspect - it seems that for some reason the eql search strategy response returns `null` for the `params.body` in complete responses, but not in partial responses and does not include index info. As a workaround, I set the inspect info on partial responses and manually add index info
  - added to-dos pointing this out in the code
- updated eql sequence queries preview to use the last event timestamp of a sequence to display the hits within a histogram
- it checks buckets length to determine noise warning for threshold rules, as opposed to total hit count
- remove unused i18n text
- fixes bug where threshold is being passed in for all rule types as it's always defined in the creation step, added a check to only pass through to `useMatrixHistogram` hook when rule type is threshold

x-pack/plugins/security_solution/public/common/hooks/eql/eql_search_response.mock.ts

@@ -0,0 +1,178 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { EqlSearchStrategyResponse } from '../../../../../data_enhanced/common';
+import { Source } from './types';
+import { EqlSearchResponse } from '../../../../common/detection_engine/types';
+import { Connection } from '@elastic/elasticsearch';
+
+export const getMockEqlResponse = (): EqlSearchStrategyResponse<EqlSearchResponse<Source>> => ({
+  id: 'some-id',
+  rawResponse: {
+    body: {
+      hits: {
+        events: [
+          {
+            _index: 'index',
+            _id: '1',
+            _source: {
+              '@timestamp': '2020-10-04T15:16:54.368707900Z',
+            },
+          },
+          {
+            _index: 'index',
+            _id: '2',
+            _source: {
+              '@timestamp': '2020-10-04T15:50:54.368707900Z',
+            },
+          },
+          {
+            _index: 'index',
+            _id: '3',
+            _source: {
+              '@timestamp': '2020-10-04T15:06:54.368707900Z',
+            },
+          },
+          {
+            _index: 'index',
+            _id: '4',
+            _source: {
+              '@timestamp': '2020-10-04T15:15:54.368707900Z',
+            },
+          },
+        ],
+        total: {
+          value: 4,
+          relation: '',
+        },
+      },
+      is_partial: false,
+      is_running: false,
+      took: 300,
+      timed_out: false,
+    },
+    headers: {},
+    warnings: [],
+    meta: {
+      aborted: false,
+      attempts: 0,
+      context: null,
+      name: 'elasticsearch-js',
+      connection: {} as Connection,
+      request: {
+        params: {
+          body: JSON.stringify({
+            filter: {
+              range: {
+                '@timestamp': {
+                  gte: '2020-10-07T00:46:12.414Z',
+                  lte: '2020-10-07T01:46:12.414Z',
+                  format: 'strict_date_optional_time',
+                },
+              },
+            },
+          }),
+          method: 'GET',
+          path: '/_eql/search/',
+          querystring: 'some query string',
+        },
+        options: {},
+        id: '',
+      },
+    },
+    statusCode: 200,
+  },
+});
+
+export const getMockEqlSequenceResponse = (): EqlSearchStrategyResponse<
+  EqlSearchResponse<Source>
+> => ({
+  id: 'some-id',
+  rawResponse: {
+    body: {
+      hits: {
+        sequences: [
+          {
+            join_keys: [],
+            events: [
+              {
+                _index: 'index',
+                _id: '1',
+                _source: {
+                  '@timestamp': '2020-10-04T15:16:54.368707900Z',
+                },
+              },
+              {
+                _index: 'index',
+                _id: '2',
+                _source: {
+                  '@timestamp': '2020-10-04T15:50:54.368707900Z',
+                },
+              },
+            ],
+          },
+          {
+            join_keys: [],
+            events: [
+              {
+                _index: 'index',
+                _id: '3',
+                _source: {
+                  '@timestamp': '2020-10-04T15:06:54.368707900Z',
+                },
+              },
+              {
+                _index: 'index',
+                _id: '4',
+                _source: {
+                  '@timestamp': '2020-10-04T15:15:54.368707900Z',
+                },
+              },
+            ],
+          },
+        ],
+        total: {
+          value: 4,
+          relation: '',
+        },
+      },
+      is_partial: false,
+      is_running: false,
+      took: 300,
+      timed_out: false,
+    },
+    headers: {},
+    warnings: [],
+    meta: {
+      aborted: false,
+      attempts: 0,
+      context: null,
+      name: 'elasticsearch-js',
+      connection: {} as Connection,
+      request: {
+        params: {
+          body: JSON.stringify({
+            filter: {
+              range: {
+                '@timestamp': {
+                  gte: '2020-10-07T00:46:12.414Z',
+                  lte: '2020-10-07T01:46:12.414Z',
+                  format: 'strict_date_optional_time',
+                },
+              },
+            },
+          }),
+          method: 'GET',
+          path: '/_eql/search/',
+          querystring: 'some query string',
+        },
+        options: {},
+        id: '',
+      },
+    },
+    statusCode: 200,
+  },
+});