[EDR Workflows] Fix Osquery cypress MKI (elastic#270088)

## Summary

Aims to fix failing Osquery cypress tests on MKI, by fetching latest
agent version on serverless environments.

MKI run successful ✅ 
-
https://buildkite.com/elastic/kibana-serverless-security-solution-quality-gate-defend-workflows/builds/4753/canvas?jid=019e444e-2276-4695-b78f-9ae1ebe8b75a&tab=output#019e444e-2276-4695-b78f-9ae1ebe8b75a/L414

```
info [cy.parallel(svl).onBeforeHook] Setting up Agent
--
  | │ info [cy.parallel(svl).onBeforeHook] Image: docker.elastic.co/elastic-agent/elastic-agent:9.4.1
  | │ info [cy.parallel(svl).onBeforeHook] Fleet Server: https://a324a2da063041458889f234f35077b4.fleet.eu-west-1.aws.qa.elastic.cloud:443
  | │ info [cy.parallel(svl).onBeforeHook] Agent container started with id 4ca9b9de0191438d0b38af38ef9963ee0a3ad873fcec75095a32ff98cf127fd1
  | info [cy.parallel(svl).onBeforeHook] Waiting for host [vp8avshr0n01] to enroll with fleet
  | info [cy.parallel(svl).onBeforeHook] Setting up Agent
  | │ info [cy.parallel(svl).onBeforeHook] Image: docker.elastic.co/elastic-agent/elastic-agent:9.4.1
  | │ info [cy.parallel(svl).onBeforeHook] Fleet Server: https://a324a2da063041458889f234f35077b4.fleet.eu-west-1.aws.qa.elastic.cloud:443
  | │ info [cy.parallel(svl).onBeforeHook] Agent container started with id 8619cbd859ad93e6350c35ef3487621ef7409dc16248ba113aa4bee3056d4c5c
  | info [cy.parallel(svl).onBeforeHook] Waiting for host [myvojsd7thgj] to enroll with fleet
```

> [!note]
> Optionally can be backported to `v9.4.x`, in case this backport PR is
merged:
> - elastic#269876
>
> Not a must, as MKI tests run on `main` only, but still cleaner.

### Checklist

Check the PR satisfies following conditions. 

Reviewers should verify this PR satisfies this list as well.

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [ ] [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
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [ ] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)
- [ ] Review the [backport
guidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)
and apply applicable `backport:*` labels.

### Identify risks

Does this PR introduce any risks? For example, consider risks like hard
to test bugs, performance regression, potential of data loss.

Describe the risk, its severity, and mitigation for each identified
risk. Invite stakeholders and evaluate how to proceed before merging.

- [ ] [See some risk
examples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)
- [ ] ...

Author: gergoabraham

x-pack/solutions/security/test/osquery_cypress/utils.ts

@@ -15,6 +15,8 @@ import type {
 import type { ToolingLog } from '@kbn/tooling-log';
 import chalk from 'chalk';
 import { getAgentVersionMatchingCurrentStack } from '@kbn/security-solution-plugin/scripts/endpoint/common/fleet_services';
+import { fetchFleetLatestAvailableAgentVersion } from '@kbn/security-solution-plugin/common/endpoint/utils/fetch_fleet_version';
+import { isServerlessKibanaFlavor } from '@kbn/security-solution-plugin/common/endpoint/utils/kibana_status';
 
 export const DEFAULT_HEADERS = Object.freeze({
   'x-elastic-internal-product': 'security-solution',
@@ -132,6 +134,11 @@ export const getLatestAvailableAgentVersion = async (
   kbnClient: KbnClient,
   log: ToolingLog
 ): Promise<string> => {
+  const isServerless = await isServerlessKibanaFlavor(kbnClient);
+  if (isServerless) {
+    return fetchFleetLatestAvailableAgentVersion(kbnClient);
+  }
+
   return getAgentVersionMatchingCurrentStack(kbnClient, log);
 };