[Index management] Skip enrich policies functional tests in serverless for mki

[sabarasaba]

Summary

I previously attempted to fix them with #172923 but seems there might be cases in which a policy wasnt cleaned up and the test still fails (see this build).

[sabarasaba]

/ci

[elasticmachine]

Pinging @elastic/platform-deployment-management (Team:Deployment Management)

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: a9d2b04

Failed CI Steps

• Serverless Rule Management - Security Solution Cypress Tests #2

Test Failures

• [job] [logs] Serverless Rule Management - Security Solution Cypress Tests #2 / Related integrations related Integrations Advanced Setting is disabled rules management table should not display a badge with the installed integrations should not display a badge with the installed integrations

Metrics [docs]

✅ unchanged

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @sabarasaba