Add risk assessment to PR template #4666

Job	Run time
Diagnostic export (ubuntu-latest, linked)	1m 2s
Diagnostic export (macos-latest, nightly-latest)	1m 14s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 3s
Diagnostic export (windows-latest, linked)	2m 45s
Diagnostic export (windows-latest, nightly-latest)	3m 3s
Diagnostic export (macos-latest, linked)	1m 27s
	10m 34s

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