Revise AWSBatch infra vs. plugin help menu and defaults

[araghukas]

Relevant PR: #88

Issue

This issue concerns the output of covalent deploy up awsbatch --help

Recommended Tasks

Beta Give feedback

1. set the credentials default to /Users/<user>/.aws/credentials".
2. double check agreement between infra and plugin defaults (e.g. vcpu vs vcpus).
3. adjust for after PR above, prefix is will be autogenerated if not specified
4. adjust for after PR above, several resource names will be autogenerated based on prefix

Consider also, changes to Covalent OS:

• distinguish/omit user-settable vs not parameters in/from help table; some param defaults a uniquely auto-generated based on the prefix (see relevant .tf files)