Fix kubectl command with multiple filenames in private cluster

[SanterreJo]

Fixes #307

[SanterreJo]

@microsoft-github-policy-service agree company="Lime Health inc."

[davidgamero]

thank you for your contribution!

looks like @jaiveerk reworked the integration tests to cover this case along with some reworks we had on the private cluster manifest functions.

merged in #325 so it should resolve this issue on next release. feel free to reopen if the issue persists :)