[8.14] Revert "[Cypress] Hardcode fleet server 8.13.0 version in…

… tests (#180… (#181341) (#181652)

# Backport

This will backport the following commits from `main` to `8.14`:
- [Revert "[Cypress] Hardcode fleet server 8.13.0 version in tests
(#180… (#181341)](#181341)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Tomasz
Ciecierski","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-04-25T06:42:58Z","message":"Revert
\"[Cypress] Hardcode fleet server 8.13.0 version in tests (#180…
(#181341)","sha":"63a56dbabbc9aa4e79ceb50d41b8372264ce877f","branchLabelMapping":{"^v8.15.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","v8.14.0","v8.15.0"],"title":"Revert
\"[Cypress] Hardcode fleet server 8.13.0 version in tests
(#180…","number":181341,"url":"https://github.com/elastic/kibana/pull/181341","mergeCommit":{"message":"Revert
\"[Cypress] Hardcode fleet server 8.13.0 version in tests (#180…
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\"[Cypress] Hardcode fleet server 8.13.0 version in tests (#180…
(#181341)","sha":"63a56dbabbc9aa4e79ceb50d41b8372264ce877f"}}]}]
BACKPORT-->

Co-authored-by: Tomasz Ciecierski <[email protected]>

x-pack/plugins/security_solution/scripts/run_cypress/parallel.ts

@@ -343,8 +343,6 @@ ${JSON.stringify(
 
                 fleetServer = await startFleetServer({
                   kbnClient,
-                  // TODO TC: https://github.com/elastic/kibana/pull/180879 - there was an issue with 8.14.0, this should be removed when it's fixed
-                  version: '8.13.0-SNAPSHOT',
                   logger: log,
                   port:
                     fleetServerPort ?? config.has('servers.fleetserver.port')

x-pack/test/osquery_cypress/fleet_server.ts

@@ -12,6 +12,7 @@ import {
   startFleetServer,
 } from '@kbn/security-solution-plugin/scripts/endpoint/common/fleet_server/fleet_server_services';
 import { Manager } from './resource_manager';
+import { getLatestAvailableAgentVersion } from './utils';
 
 export class FleetManager extends Manager {
   private fleetServer: StartedFleetServer | undefined = undefined;
@@ -25,8 +26,7 @@ export class FleetManager extends Manager {
   }
 
   public async setup(): Promise<void> {
-    // TODO TC: https://github.com/elastic/kibana/pull/180879 - there was an issue with 8.14.0, this should be removed when it's fixed
-    const version = '8.13.0-SNAPSHOT';
+    const version = await getLatestAvailableAgentVersion(this.kbnClient);
     this.fleetServer = await startFleetServer({
       kbnClient: this.kbnClient,
       logger: this.log,