As we prepare to do a release, we generally create an issue that
contains instructions and checklists for the mechanics of the release.
This change adds a template for these issues.
This adds a new issue template for user support issues. These are
distinct from bug reports because they may not be bugs and might just be
users needing help.
This change introduces three new issue templates for DXC. The three
issue templates are:
* feature_request - Issues filed with this template will get
automatically tagged with the `enhancement` label
* bug_report - Issues filed with this template will get automatically
get tagged with the `bug` label
* bug_report_spirv - Issues filed with this template will get
automatically tagged with the `bug` and `spirv` labels
The bug_report and bug_report_spirv templates are otherwise identical,
but could diverge to better meet the needs of the supporting teams.
Fixes#4975.