batches: ensure .gitconfig email is properly inserted in batch spec

Created by: BolajiOlajide

In src-cli, we use the html/template library to substitute values, however, characters like + gets converted to it's unicode equivalent &043;

Before

After

Test plan

• Enable email privacy on your Github account.
• Set your github-private email address in your global config with the command

git config --global add user.email <private_email_address>

• Create a batch spec with the command src batch new -f batch.spec.yml
• The email address should be inserted into the template as plain text instead of unicode.