fix inplace mutation

[dwreeves]

operator_args.pop() causes an in-place mutation, which long story short caused an issue for me today. I think it is a lot safer to rely on a copy() if the DbtToAirflowConverter is going to mutate the user inputs.

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[jbandoro]

Thanks @dwreeves! This fixes the same issue that #835 tries to fix from user reports in Slack. The inplace updates for operator_args were for "env" or "vars" which #835 fixes, and there shouldn't be any updates in the rest of the converter because they're shallow copied below to the task_args:

astronomer-cosmos/cosmos/converter.py

Lines 246 to 253 in 72690d3

	task_args = {
	**operator_args,
	"project_dir": execution_config.project_path,
	"profile_config": profile_config,
	"emit_datasets": render_config.emit_datasets,
	"env": env_vars,
	"vars": dbt_vars,
	}

[dwreeves]

Ah I should have looked at existing PRs. I can close this then.