ci: elastic-agent goIntegTest is not available

[v1v]

What does this PR do?

Remove goIntegTest for the x-pack/elastic-agent

Why is it important?

It returns

beats/dev-tools/mage/target/integtest/notests/integtest.go

Lines 27 to 30 in 76bf18b

	// GoIntegTest method informs that no integration tests will be executed.
	func GoIntegTest() {
	fmt.Println(">> integTest: Complete (no tests require the integ test environment)")
	}

https://beats-ci.elastic.co/blue/organizations/jenkins/Beats%2Fbeats/detail/8.0/186/pipeline/7115#step-14750-log-2

[mergify]

This pull request does not have a backport label. Could you fix it @v1v? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 7./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2021-12-24T09:22:28.422+0000

• Duration: 98 min 28 sec

• Commit: af7404b

Test stats 🧪

Test	Results
Failed	0
Passed	7120
Skipped	16
Total	7136

💚 Flaky test report

Tests succeeded.

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[v1v]

/test

[v1v]

/test

[v1v]

/test

[v1v]

e2e-testing failure unrelated to this particular PR. so I'll merge it now