gh-97669: Remove outdated example scripts

[vstinner]

Remove outdated example scripts. Copy them from Python 3.11 if you still need them.

Removed scripts:

• byext.py
• byteyears.py
• cleanfuture.py
• copytime.py
• crlf.py
• db2pickle.py
• dutree.doc
• dutree.py
• find-uname.py
• find_recursionlimit.py
• finddiv.py
• findlinksto.py
• findnocoding.py
• fixcid.py
• fixdiv.py
• fixheader.py
• fixnotice.py
• fixps.py
• get-remote-certificate.py
• google.py
• highlight.py
• ifdef.py
• import_diagnostics.py
• lfcr.py
• linktree.py
• lll.py
• mailerdaemon.py
• make_ctype.py
• md5sum.py
• mkreal.py
• objgraph.py
• parse_html5_entities.py
• pdeps.py
• pickle2db.py
• pindent.py
• pysource.py
• reindent-rst.py
• rgrep.py
• suff.py
• texi2html.py
• untabify.py
• which.py

Changes:

• Remove test_fixcid, test_pdeps and test_pindent of test.test_tools.
• Remove get-remote-certificate.py changelog entry, since the script was removed.
• FYI there is a copy of crlf.py in Lib/test/test_lib2to3/data/.

• Issue: Remove outdated Tools/scripts/ example scripts #97669

[vstinner]

Here is a first PR to remove scripts which look outdated to me. The remaining ones might be useful or are referenced in other parts of Python, so I prefer to write separated PRs for the other scripts that I plan to remove.

[vstinner]

Oh, I didn't want to remove md5sum.py in this PR. I also restored untabify.py since it's used by patchcheck.py.

[vstinner]

Ooops, I didn't plan to create a PR on the branch "main", so I created a new PR: PR #97675.