RFR: 8357920: Add .rej and .orig to .gitignore

[Magnus Ihse Bursie]

On Tue, 27 May 2025 21:59:05 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> The file types .rej and .orig are often created by diff tools. Adding them to .gitignore will help people from mistakenly committing these files.
> 
> See https://github.com/openjdk/jdk/pull/25306#discussion_r2102407122 for an example of where this happened.

I opened https://bugs.openjdk.org/browse/SKARA-2514 for a jcheck enhancement. I recommend that we revert this change once that is implemented.

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PR Comment: https://git.openjdk.org/jdk/pull/25474#issuecomment-2955829763