Merge branch 'ps/test-wo-perl-prereq' into ps/fewer-perl

* ps/test-wo-perl-prereq: t5703: refactor test to not depend on Perl t5316: refactor `max_chain()` to not depend on Perl t0210: refactor trace2 scrubbing to not use Perl t0021: refactor `generate_random_characters()` to not depend on Perl t/lib-httpd: refactor "one-time-perl" CGI script to not depend on Perl t/lib-t6000: refactor `name_from_description()` to not depend on Perl t/lib-gpg: refactor `sanitize_pgp()` to not depend on Perl t: refactor tests depending on Perl for textconv scripts t: refactor tests depending on Perl to print data t: refactor tests depending on Perl substitution operator t: refactor tests depending on Perl transliteration operator Makefile: stop requiring Perl when running tests meson: stop requiring Perl when tests are enabled t: adapt existing PERL prerequisites t: introduce PERL_TEST_HELPERS prerequisite t: adapt `test_readlink()` to not use Perl t: adapt `test_copy_bytes()` to not use Perl t: adapt character translation helpers to not use Perl t: refactor environment sanitization to not use Perl t: skip chain lint when PERL_PATH is unset