[Perl/perl5] ae7871: mark test modules (found in ext/*/t/) as no_index

[Tony Cook via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: ae7871d912901ad79eb630774844a7fd6dd3def1
      
https://github.com/Perl/perl5/commit/ae7871d912901ad79eb630774844a7fd6dd3def1
  Author: Tony Cook <t...@develop-help.com>
  Date:   2021-05-24 (Mon, 24 May 2021)

  Changed paths:
    M META.json
    M META.yml
    M Porting/makemeta

  Log Message:
  -----------
  mark test modules (found in ext/*/t/) as no_index

fixes #18632