Summary:
Fixing internal validator failure
```
Every project specific source file must contain a doc block with an appropriate copyright header. Unrelated files must be listed as exceptions in the Copyright Headers Exceptions page in the repo dashboard.
A copyright header clearly indicates that the code is owned by Meta. Every open source file must start with a comment containing "Meta Platforms, Inc. and affiliates"
https://github.com/facebook/rocksdb/blob/main/buckifier/targets_cfg.py:
The first 16 lines of 'buckifier/targets_cfg.py' do not contain the patterns:
(Meta Platforms, Inc. and affiliates)|(Facebook, Inc(\.|,)? and its affiliates)|([0-9]{4}-present(\.|,)? Facebook)|([0-9]{4}(\.|,)? Facebook)
```
While fixing the text to pass the linter, I took the opportunity to modify `format-diff.sh` script to add the copyright header automatically if missing in new files.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/14143
Test Plan:
```
$> make format
```
**new python file**
```
build_tools/format-diff.sh
Checking format of uncommitted changes...
Checking for copyright headers in new files...
Added copyright header to build_tools/test.py
Copyright headers were added to new files.
Nothing needs to be reformatted!
```
**new header file**
```
build_tools/format-diff.sh
Checking format of uncommitted changes...
Checking for copyright headers in new files...
Added copyright header to db/db_impl/db_impl_jewoongh.h
Copyright headers were added to new files.
Nothing needs to be reformatted!
```
Reviewed By: hx235
Differential Revision: D87653124
Pulled By: jaykorean
fbshipit-source-id: 164322cfcd2c162bb3b41bb8f3bafefa3f20b695
c4bbad4dfe