Enable agent container e2e tests

[michel-laterman]

Enable agent container e2e tests

• Closes [Flaky Test]: e2e agent container tests flakey #3909

[mergify]

This pull request does not have a backport label. Could you fix it @michel-laterman? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-./d./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[michel-laterman]

buildkite test this

[michel-laterman]

buildkite test this

[michel-laterman]

buildkite test this

[michel-laterman]

buildkite test this

[michel-laterman]

buildkite test this

[michel-laterman]

buildkite test this

[michel-laterman]

After running the testsuite 7 times, we found one instance where a test failed.
This is caused by a bug with agent enrollment and is being addressed here: elastic/elastic-agent#8056

[michel-laterman]

buildkite test this

[michel-laterman]

buildkite test this

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[prodsecmachine]

🎉 Snyk checks have passed. No issues have been found so far.

✅ security/snyk check is complete. No issues have been found. (View Details)

✅ license/snyk check is complete. No issues have been found. (View Details)