Generalize AWS config.resources for compute parition; add mem_node_max

[TaylorRoper-NOAA]

Description

This PR generalizes the AWS GFS config.resources.AWSPW file for the default compute partition and specifies mem_node_max for this partition in the AWS machine block for GFS config.resources.

Resolves #4213

Type of change

• Bug fix (fixes something broken)
• New feature (adds functionality)
• Maintenance (code refactor, clean-up, new CI test, etc.)

Change characteristics

• Is this change expected to change outputs (e.g. value changes to existing outputs, new files stored in COM, files removed from COM, filename changes, additions/subtractions to archives)? NO
• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO
• Does this change require an update to any of the following submodules? NO

How has this been tested?

• Create generate experiment on AWS using setup_expt.py
• Edit max_tasks_per_node and/or mem_node_max in AWS block of `config.resources' in experiment directory to various settings
• Generate and verify nodes and cores settings for jobs with <partition>compute</partition> in resulting rocoto XML file

Checklist

• Any dependent changes have been merged and published
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have documented my code, including function, input, and output descriptions
• My changes generate no new warnings
• New and existing tests pass with my changes
• This change is covered by an existing CI test or a new one has been added
• Any new scripts have been added to the .github/CODEOWNERS file with owners
• I have made corresponding changes to the system documentation if necessary

[aerorahul]

lgtm