Add risk assessment to PR template #4656

Job	Run time
Diagnostic export (ubuntu-latest, nightly-latest)	1m 39s
Diagnostic export (ubuntu-latest, linked)	1m 25s
Diagnostic export (macos-latest, nightly-latest)	2m 39s
Diagnostic export (macos-latest, linked)	2m 6s
Diagnostic export (windows-latest, linked)	3m 48s
Diagnostic export (windows-latest, nightly-latest)	3m 7s
	14m 44s

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