[Internal] [Feature] Cloud support for submissions

[jessicarowell]

Integrate cloud-to-cloud support for NCBI submissions.
Integrate cloud-to local-to ftp support for NCBI submissions.

Place an ❌ in a Box that Best Matches the Feature's Importance:

• [] 1 - Most important (absolutely integral and will not use codebase at all without it)
• 2-4 - Moderate (still using codebase for other functions but is serving as a blocker for future use-cases)
• [] 5 - Least important (would like to see but there are no stringent expectations nor urgency for current/future use-cases) 

Modify file path validation to ignore cloud paths (for now). Later integrate cloud credentials to check cloud file paths.

Cloud-to-cloud support is tricky because Nextflow automatically copies file paths to a working directory when they are used as channel inputs to a process. Cloud-to local-to ftp will be easier - but we will need to integrate cloud credentials to fetch the cloud paths.