Merge bitcoin#23312: tests: reduce feature_segwit.py usage of the legacy wallet

e9ade03 tests: Add feature_segwit.py --descriptors to test_runner.py (Andrew Chow)
ae6cbcc tests: restrict feature_segwit legacy wallet import tests (Andrew Chow)
1d13c44 tests: Use descriptors for feature_segwit multisig setup (Andrew Chow)

Pull request description:

  `feature_segwit.py` has tests for some legacy wallet behavior, but otherwise does not really need the legacy wallet. Those parts now require `--legacy-wallet` to be provided (as with other legacy wallet tests). Other parts of the test are changed to work with descriptor wallets as well.

ACKs for top commit:
  lsilva01:
    tACK e9ade03

Tree-SHA512: 4ae76a4d2a8d318e7f8ad4c984748e3cdd67ed00359fcd798a08492ed9399b1d01be88c9ebea3d6c996fbe190cf41708a15c98f088f0cb5c47d6d00fff258944

Author: MarcoFalke