[7.16](backport #28812) Revert "chore(ci): disable E2E tests in Beats (#28715)"

[mergify]

This is an automatic backport of pull request #28812 done by Mergify.

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[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2021-11-05T11:25:03.535+0000

• Duration: 189 min 19 sec

• Commit: be0b67a

Test stats 🧪

Test	Results
Failed	0
Passed	55087
Skipped	5315
Total	60402

💚 Flaky test report

Tests succeeded.

🤖 GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• /package : Generate the packages and run the E2E tests.

• /beats-tester : Run the installation tests with beats-tester.