[core] Dynamically generate invalid config files in unit tests

[t1m0thyj]

Instead of adding a new zowe.config.json and zowe.schema.json file to the repo for every combination of invalid config/schema that we want to test, could we generate the invalid JSON files programmatically?

For example, in the test that requires "invalid.zowe.config.json" we could do something like this:

with open(self.original_file_path, 'r') as f:
    original_config = commentjson.load(f)
original_config["$schema"] = "./invalid.zowe.schema.json"
with open(os.path.join(self.custom_dir, "invalid.zowe.config.json"), 'w') as f:
    commentjson.dump(original_config, f)

Originally posted by @t1m0thyj in #192 (comment)

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[aadityasinha-dotcom]

Please assign this to me 😄