osd: use cp -a command for copying init-containers binary

[Sheetalpamecha]

remove copy-binaries cmd and related code

Description of your changes:

Which issue is resolved by this Pull Request:
Resolves #5296

Checklist:

• Commit Message Formatting: Commit titles and messages follow guidelines in the developer guide.
• Skip Tests for Docs: If this is only a documentation change, add the label skip-ci on the PR.
• Reviewed the developer guide on Submitting a Pull Request
• Pending release notes updated with breaking and/or notable changes for the next minor release.
• Documentation has been updated, if necessary.
• Unit tests have been added, if necessary.
• Integration tests have been added, if necessary.

[travisn]

@BlaineEXE Do you recall why we implemented the copy-binaries command instead of using cp like this?

[BlaineEXE]

I don't recall why I implemented it as a daemon. It used to copy tini as well as rook, but that's no longer needed. I think I may have implemented it as a binary simply because the behavior used to be accomplished by the OSD daemon process and not considered cp as a good method. TBH, I think this is a much better approach.

[BlaineEXE]

This is not urgent, so I will wait for @travisn to get back from vacation. I think it may make sense to merge this into master and not backport it so that we have some time to make sure it does not negatively affect anything in master. I don't anticipate any issues, but there is always a small chance.

[Sheetalpamecha]

No code change done, forced pushed to rerun all failing test case.