Merge #15686: [tests] make pruning test faster

03d6d23810 [tests] make pruning test faster (John Newbery)
1c29ac40fb [tests] style fixes in feature_pruning.py (John Newbery)

Pull request description:

  This commit makes the pruning.py much faster.

  Key insights to do this:

  - pruning.py doesn't care what kind of transactions make up the big
  blocks that are pruned in the test. Instead of making blocks with
  several large, expensive to construct and validate transactions,
  instead make the large blocks contain a single coinbase transaction with
  a huge OP_RETURN txout.
  - avoid stop-starting nodes where possible.

ACKs for commit 03d6d2:
  MarcoFalke:
    utACK 03d6d238104d228acfae9f3e122879bddef8d27d

Tree-SHA512: 511642ce0fa294319dce3486fe06d75970d8ab66deda7f692be081d3056b4ce5b4cf91a7b5762eefbba224ba6c848750016454ff1e5d564acc507b1c41213628

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