[8.0](backport #28715) chore(ci): disable E2E tests in Beats

[mergify]

This is an automatic backport of pull request #28715 done by Mergify.

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[elasticmachine]

💔 Build Failed

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Build stats

• Start Time: 2021-11-02T09:20:50.890+0000

• Duration: 185 min 35 sec

• Commit: 7f047d1

Test stats 🧪

Test	Results
Failed	0
Passed	53494
Skipped	5353
Total	58847

Steps errors

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Sleep

• Took 0 min 1 sec . View more details here
• Description: 5

x-pack/filebeat-unitTest - mage build unitTest

• Took 6 min 21 sec . View more details here
• Description: mage build unitTest

Print Message

• Took 0 min 0 sec . View more details here
• Description: �[39;49m[INFO] Allocating a worker with the labels 'windows-2008-r2'.�[0m

x-pack/metricbeat-windows-10-windows-10 - mage build unitTest

• Took 9 min 38 sec . View more details here
• Description: mage build unitTest

💚 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.