[8.17] [Automatic Import] Correctly output icons in the manifest (#201139)

[kibanamachine]

Backport

This will backport the following commits from main to 8.17:

• [Automatic Import] Correctly output icons in the manifest (#201139)

Questions ?

Please refer to the Backport tool documentation

[elasticmachine]

:green_heart: Build Succeeded

• Buildkite Build
• Commit: b5508e0069d88d5300a69a05e7b23a9cd338d2b4

Metrics [docs]

✅ unchanged

cc @ilyannn