Cherry-pick #24346 to 7.12: Fix capabilities resolution in inspect command

[michalpristas]

Cherry-pick of PR #24343 to 7.12 branch. Original message:

What does this PR do?

This one was reported by @faec during testing.

When using inspect command type of object is resolved as map[interface{}]interface{} instead of usual map[string]interface{}
This PR allows capabilities handle this type as well.

Why is it important?

Resolve same config in pipeline and inspect

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.

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[elasticmachine]

Pinging @elastic/agent (Team:Agent)

[blakerouse]

Backport looks good

[elasticmachine]

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Build stats

• Build Cause: Pull request #24399 opened

• Start Time: 2021-03-05T17:09:24.745+0000

• Duration: 156 min 5 sec

• Commit: 400ca7c

Test stats 🧪

Test	Results
Failed	0
Passed	6500
Skipped	24
Total	6524

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Test stats 🧪

Test	Results
Failed	0
Passed	6500
Skipped	24
Total	6524