Merge #17691: doc: Add missed copyright headers

fac86ac7b3ceac2f884412c7a9f4bd5bab5e3916 scripted-diff: Add missed copyright headers (Hennadii Stepanov)
6fde9d5e47fc9a1042b3fb68031eab5bf55e508d script: Update EXLUDE list in copyright_header.py (Hennadii Stepanov)
1998152f15fd2b0e83f5068c375a34feaf73db8c script: Add empty line after C++ copyright (Hennadii Stepanov)
071f2fc204f542c5a287ca8835115a2ee0bf2f50 script: Add ability to insert copyright to *.sh (Hennadii Stepanov)

Pull request description:

  This PR improves `contrib/devtools/copyright_header.py` script and adds copyright headers to the files in `src` and `test` directories with two exceptions:
  - [`src/reverse_iterator.h`](https://github.com/bitcoin/bitcoin/blob/master/src/reverse_iterator.h) (added to exceptions)
  - [`src/test/fuzz/FuzzedDataProvider.h`](https://github.com/bitcoin/bitcoin/blob/master/src/test/fuzz/FuzzedDataProvider.h) (added to exceptions)

  On master 5622d8f3156a293e61d0964c33d4b21d8c9fd5e0:
  ```
  $ ./contrib/devtools/copyright_header.py report . | grep zero
    25 with zero copyrights
  ```

  With this PR:
  ```
  $ ./contrib/devtools/copyright_header.py report . | grep zero
     2 with zero copyrights
  ```

  ~I am uncertain about our copyright policy with `build_msvc` and `contrib` directories content, so they are out of scope of this PR.~

ACKs for top commit:
  MarcoFalke:
    ACK fac86ac7b3ceac2f884412c7a9f4bd5bab5e3916

Tree-SHA512: d7832c4a7a1a3b7806119775b40ec35d7982f49ff0e6199b8cee4c0e0a36e68d51728b6ee9924b1c161df4bc6105bd93391b79d42914357fa522f499cb113fa8

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