chore: Update issue templates to not include ticket routing in rendered issue

[jonathan-innis]

Fixes #N/A

Description

This updates the issue template to use Github alert syntax for surfacing the important routing detail in markdown at the top of issues, but not to include this note in the rendered issue once it's created.

Issue creation will now look like this when someone goes through the issue creation form:

How was this change tested?

Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: #
• No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[coveralls]

Pull Request Test Coverage Report for Build 7380119943

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.02%) to 82.53%

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Totals
Change from base Build 7379018374:	-0.02%
Covered Lines:	4951
Relevant Lines:	5999

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💛 - Coveralls

[njtran]

/lgtm
/approve