We should rename the --appSizeBase and --appSizeTest CLI args

We should deprecate the --appSizeBase and --appSizeTest CLI args, and re-name them to something like --app-size-base and --app-size-test.

Start by locating the CLI argument definitions and any tests covering --appSizeBase and --appSizeTest. Check how argument deprecation is handled elsewhere in the repository. Done means the hyphenated arguments work, the old spellings are deprecated appropriately, and relevant tests cover both forms.

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