Add enc_temp_folder to .gitignore

[claywar]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

For some reason, VS2022 likes to cache everything modified while running in enc_temp_folder within the repo root. Adds that to .gitignore

Steps to test these changes

Run server via VS2022 and make changes to any file, see only the changed file and not the stale backup