[7.16](backport #1764) fix: properly copy files from compose to elastic-package

[mergify]

This is an automatic backport of pull request #1764 done by Mergify.
Cherry-pick of 293ba96 has failed:

On branch mergify/bp/7.16/pr-1764
Your branch is up to date with 'origin/7.16'.

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	both modified:   internal/deploy/elastic_package.go

no changes added to commit (use "git add" and/or "git commit -a")

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[elasticmachine]

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