doc: Add missed copyright headers
doc: Add missed copyright headers

Summary:
script: Add ability to insert copyright to *.sh
script: Add empty line after C++ copyright
script: Update EXLUDE list in copyright_header.py

This is a backport of [[https://github.com/bitcoin/bitcoin/pull/17691 | core#17691]] [1/2]
https://github.com/bitcoin/bitcoin/pull/17691/commits/071f2fc204f542c5a287ca8835115a2ee0bf2f50
https://github.com/bitcoin/bitcoin/pull/17691/commits/1998152f15fd2b0e83f5068c375a34feaf73db8c
https://github.com/bitcoin/bitcoin/pull/17691/commits/6fde9d5e47fc9a1042b3fb68031eab5bf55e508d

Depends on D9813

Test Plan: `./contrib/devtools/copyright_header.py report .`

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D9814

Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc,Bitcoin-ABC/bitcoin-abc