Remove unused field from code-intel issue template

Created by: sulunemre

One of the issue templates has the projects key in its header but this key is invalid and it does nothing. Valid keys are: about, title, labels, assignees. That's why I am removing it. See: https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository#creating-issue-templates

Test plan

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