Cherry-pick #22057 to 7.10: Fix missing variable loading aws pipelines

[jsoriano]

Partial cherry-pick of PR #22057 to 7.10 branch.

What does this PR do?

Add missing fips_enabled to fileset manifests.

Fixes #22608.

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 TBD in Add a test to detect missing variables in fileset configurations #22649
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

[elasticmachine]

Pinging @elastic/integrations-platforms (Team:Platforms)

[elasticmachine]

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Build stats

• Build Cause: [Pull request #22645 updated]

• Start Time: 2020-11-18T10:53:24.534+0000

• Duration: 47 min 22 sec

Test stats 🧪

Test	Results
Failed	0
Passed	1947
Skipped	259
Total	2206

💚 Flaky test report

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Test stats 🧪

Test	Results
Failed	0
Passed	1947
Skipped	259
Total	2206

[urso]

This issue should have been found by CI. If not, let's add a test that would have caught it. E.g. explicitely running filebeat setup ... per module.

[jsoriano]

@urso good idea, issue created for that: #22649

Actually we run filebeat setup per module in the module tests, but not with the default configurations.