contrib: remove copyright_header.py #34119

1. 
   fanquake commented at 4:51 pm on December 19, 2025: member

   After #34084, our copyright headers shouldn’t need “managing”; so remove the Python script.
2. DrahtBot added the label Scripts and tools on Dec 19, 2025
3. 
   DrahtBot commented at 4:52 pm on December 19, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/34119.

   Reviews

   See the guideline for information on the review process. A summary of reviews will appear here.

4. scripted-diff: [doc] Unify stale copyright headers

   -BEGIN VERIFY SCRIPT-
   
   sed --in-place --regexp-extended \
          's;( 20[0-2][0-9])(-20[0-2][0-9])? The Bitcoin Core developers;\1-present The Bitcoin Core developers;g' \
          $( git grep -l 'The Bitcoin Core developers' -- ':(exclude)COPYING' ':(exclude)src/ipc/libmultiprocess' ':(exclude)src/minisketch' )
   
   -END VERIFY SCRIPT-

   3e4765ee10
5. contrib: remove copyright_header.py ba6315d2f6
6. fanquake force-pushed on Dec 19, 2025
7. DrahtBot added the label CI failed on Dec 19, 2025
8. 
   l0rinc commented at 5:53 pm on December 19, 2025: contributor

   Should we add copyrights to the sources that don’t currently have any such header (see: #34084 (comment))?
9. DrahtBot removed the label CI failed on Dec 19, 2025

Contributors
fanquake DrahtBot l0rinc

Labels
Scripts and tools