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merge-script af0e6a65c9 Merge bitcoin/bitcoin#33702 : contrib: Remove brittle, confusing and redundant UTF8 encoding from Python IO

fad6118586 test: Fix "typo" in written invalid content (MarcoFalke)
fab085c15f contrib: Use text=True in subprocess over manual encoding handling (MarcoFalke)
fa71c15f86 scripted-diff: Bump copyright headers after encoding changes (MarcoFalke)
fae612424b contrib: Remove confusing and redundant encoding from IO (MarcoFalke)
fa7d72bd1b lint: Drop check to enforce encoding to be specified in Python scripts (MarcoFalke)
faf39d8539 test: Clarify that Python UTF-8 mode is the default today for most systems (MarcoFalke)
fa83e3a81d lint: Do not allow locale dependent shell scripts (MarcoFalke)

Pull request description:

  Historically, there was an attempt via `test/lint/lint-python-utf8-encoding.py` to enforce explicit UTF8 in every Python IO statement (`open`, `subprocess`, ...). However, the lint check has many problems:

  * The check is incomplete and many IO statements lack the explicit UTF8 specification.
  * It was added at a time when some systems were not UTF8 by default.
  * The check is brittle, as it depends on a fragile regex.

  In theory, now that the minimum Python version is 3.10 (since commit 2123c94448), the check could be replaced by `PYTHONWARNDEFAULTENCODING=1` from https://docs.python.org/3/whatsnew/3.10.html#optional-encodingwarning-and-encoding-locale-option. However, this comes with many other problems:

  * All our Python scripts already assume and require UTF8 to be set externally. On almost all modern systems, this is already the default. Some Windows versions do not have UTF8 by default and require `PYTHONUTF8=1` to be set for the tests to run already today (with or without the changes in this pull). Also, the CI and many other Bash scripts force UTF8 via `LC_ALL`. Finally, Python 3.15 will likely enable UTF8 on *all* systems by default, per https://peps.python.org/pep-0686/#abstract.
  * So adding UTF8 to every single IO call is redundant, verbose, and confusing, given that it is the expected default.

  So fix all issues, by:

  * Removing the `test/lint/lint-python-utf8-encoding.py` check.
  * Removing the encoding on the individual IO calls.
  * Clarifying the existing docs around the existing UTF8 requirement and assumption.

  Obviously, every IO call is still free to specify UTF8 or any other encoding explicitly, if there is a documented need for it in the future.

ACKs for top commit:
  theStack:
    re-ACK fad6118586
  laanwj:
    Re-ACK fad6118586

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