Deprecate --dev related switches

[qmarcou]

Description

This PR is a follow up of #641 .

In a nutshell --dev/--no-dev switches are incorrectly documented, inconsistent, as well as redundant (albeit with some clashes) with the --extra CLI.

Changes made deprecate explicitly all --(no-)dev(-dependencies) by raising a meaningful exception.

Limits:

• the deprecation is not in pytest tests. In fact there were no prior tests concerning "--dev" switches, there is a dedicated but unused pytest fixture:
  

  conda-lock/tests/test_conda_lock.py

  Lines 356 to 364 in f753f70

  	@pytest.fixture(
  	scope="function",
  	params=[
  	pytest.param(True, id="--dev-dependencies"),
  	pytest.param(False, id="--no-dev-dependencies"),
  	],
  	)
  	def include_dev_dependencies(request: Any) -> bool:
  	return request.param

  
  It seems there is currently no tests regarding the --extra switches behavior.
• ongoing discussion about the default behavior of --extras in incorrect install command suggested in conda-lock.yml comments with 'dev' extra dependencies #641

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