Config Changes

[jaredoconnell]

Changes introduced with this PR

NOTE: Workflows will need to be updated if they used any of the removed or changed fields.

This updates the Podman deployer to:

• Use the same config format as the Docker deployer when possible.
• Remove duplicate fields, where one field previously did nothing.
• Disable the fields that are not used, but are shared with the Docker deployer.
• Fix tests for Mac OS.
• Replace OS and Arch with platform, since that's the format used by both Podman and Docker. The validation is still done with a regular expression.
• Remove clunky test configuration fields.

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