[Timelines] Update fields metadata from beats 8.0 (#123014)

* Move beats metadata script to timelines plugin

This is the plugin that consumes the artifacts of the script, not
security_solution.

* Remove unused beats metadata file

This file also exists in the timelines plugin, but only that one is
used.

* Update fields metadata from beats 8.0.0-rc1

This will serve as the data source for our metadata in kibana 8.0.

* Update indexFields unit tests following ECS update

8.0 introduced some textual changes to field descriptions.

* Revert "Move beats metadata script to timelines plugin"

This reverts commit cbc8e9d.

* Update script to modify the appropriate timelines file

This is the one used by IndexFields.

Co-authored-by: Kibana Machine <[email protected]>

x-pack/plugins/security_solution/package.json

@@ -6,7 +6,7 @@
   "license": "Elastic-License",
   "scripts": {
     "extract-mitre-attacks": "node scripts/extract_tactics_techniques_mitre.js && node ../../../scripts/eslint ./public/detections/mitre/mitre_tactics_techniques.ts --fix",
-    "build-beat-doc": "node scripts/beat_docs/build.js && node ../../../scripts/eslint ./server/utils/beat_schema/fields.ts --fix",
+    "build-beat-doc": "node scripts/beat_docs/build.js && node ../../../scripts/eslint ../timelines/server/utils/beat_schema/fields.ts --fix",
     "cypress": "../../../node_modules/.bin/cypress",
     "cypress:open": "yarn cypress open --config-file ./cypress/cypress.json",
     "cypress:open:ccs": "yarn cypress:open --config integrationFolder=./cypress/ccs_integration",

x-pack/plugins/security_solution/scripts/beat_docs/build.js

@@ -25,8 +25,8 @@ const tar = require('tar');
 const zlib = require('zlib');
 
 const OUTPUT_DIRECTORY = resolve('scripts', 'beat_docs');
-const OUTPUT_SERVER_DIRECTORY = resolve('server', 'utils', 'beat_schema');
-const BEATS_VERSION = '7.14.0';
+const OUTPUT_SERVER_DIRECTORY = resolve('../timelines', 'server', 'utils', 'beat_schema');
+const BEATS_VERSION = '8.0.0-rc1';
 
 const beats = [
   {