[BUG] Cloning does not consider files located outside of stacks

[soerenmartius]

Describe the bug
Cloning multiple stacks starting at a root directory does not copy the config.tm.hcl located at the base, which is not part of a stack. I would expect that all files in the defined folder are cloned, regardless if it is a stack or not.

To Reproduce

Steps to reproduce the behavior:

1. Create a new directory dev
2. Add a file config.tm.hcl inside of dev
3. Add a stack in dev ,terramate create dev/one
4. Clone the dev directory: terramate experimental clone dev foo

Expected behavior
The config.tm.hcl should be cloned.

Log Output
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Environment (please complete the following information):

• OS: MacOs
• OS Version Latest
• Terramate Version 0.8.4