Create shared example in devutils for each plugin to verify that the initialize params are not modified

As a plugin author can override `initialize` and can undo the deep_clone of the params in `plugin.rb` we should have a shared example that is run in the plugin repo specs.

Start by reading plugin.rb to understand the existing deep_clone behavior, then inspect devutils for existing shared examples and the plugin repository specs that consume them. The work is done when each plugin's specs can run the shared example and verify that initialize parameters are not modified.

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