refactoring: raise_ is implemented 3 times

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These are all the same function:

• effect/effect/_test_utils.py

  Line 52 in 826cbc5

  def raise_(e):

• effect/effect/_base.py

  Line 183 in 826cbc5

  def raise_(exception, tb=None):

• effect/effect/test_retry.py

  Line 63 in 826cbc5

  def raise_(exc):

so probably some of them should import the one implementation