test: Use same Python executable for subprocesses as for all-lint.py
#26802
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Before this all linters were ran by
/usr/bin/env python3, no matter what was used to runtest/lint/all-lint.py. This change allows to use non-default Python executable fortest/lint/all-lint.pyand then all subprocesses will also use same Python interpreter (for example,python3.10 ./test/lint/all-lint.py). See #26792 (comment) as use case.