Merge bitcoin/bitcoin#24496: test: refactor: use `random.sample` for choosing random keys in wallet_taproot.py

31846b006da46852cfce91e53427dc8f871b3fda test: refactor: use `random.sample` for choosing random keys in wallet_taproot.py (Sebastian Falbesoner)

Pull request description:

  The Python3 standard library method `random.sample` has the exact same functionality as the helper method `rand_keys(...)` (that is, random sampling without replacement) on a generic set or sequence, i.e. we can simply replace it. See https://docs.python.org/3/library/random.html#random.sample
  Note that this is also safer: in case that the sample size `k` is larger than the population count, `random.sample` throws an error:
  ```
  $ python3
  Python 3.8.12 (default, Sep 26 2021, 13:12:50)
  [Clang 11.1.0 ] on openbsd7
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import random
  >>> random.sample([23, 42], 3)
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/usr/local/lib/python3.8/random.py", line 363, in sample
      raise ValueError("Sample larger than population or is negative")
  ValueError: Sample larger than population or is negative
  ```
  while the custom method would get stuck in an endless loop.

ACKs for top commit:
  shaavan:
    Code Review ACK 31846b006da46852cfce91e53427dc8f871b3fda

Tree-SHA512: d9bd7f8128e43401a5b0388e48ba838155b21db5b4b6ba95c91285880788bc3917cb656b74bbe2d97faf7b44862d20b0899dc3c56aa48b9d2b33b50e37d089f6

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