[8.14](backport #39235) Add MODULE definition for x-pack/dockerlogbeat Go Integration tests

[mergify]

Proposed commit message

In scope of https://github.com/elastic/ingest-dev/issues/3254 - added MODULE env var definition for Go Integration tests to match same behavior as on Jenkins.
Jenkins vs. Buildkite comparison: https://gist.github.com/oakrizan/bf2aa5f1cd1ab01daa1184f471a99abc
BK build: https://buildkite.com/elastic/beats-xpack-dockerlogbeat/builds?branch=elastic%3Amergify%2Fbp%2F8.14%2Fpr-39235

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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---

This is an automatic backport of pull request #39235 done by [Mergify](https://mergify.com).

[elasticmachine]

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• Start Time: 2024-05-09T06:51:01.023+0000

• Duration: 13 min 44 sec

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Test	Results
Failed	0
Passed	2
Skipped	0
Total	2

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[dliappis]

LGTM