[ Refactor ] Consider aligning TOWER_AWS_* keys to AWS equivalents

[gwright99]

The ssm_sensitive_values_seqerakit.json contains 3 AWS entries (representing the 3 available fields for an AWS-type credential).

While pursuing an unassisted implementation, a recent custom found the key names unclear and requested clarificiation. We should consider renaming these two keys to align with the standard AWS names:

• AWS_ACCESS_KEY_ID
• AWS_SECRET_ACCESS_KEY

TO DO

• Determine if this change affects any logic elsewhere in the tool.
• Determine if making this change to an existing implementation breaks anything (unlikely but best to confirm).
• Align (if necessary) Ansible values, primarily in 06_run_seqerakit.yml.tpl