remove Clippy flags from the PR template (#10087) #2618

Job	Run time
plugins (windows-latest)	10m 48s
plugins (macos-latest)	5m 16s
plugins (ubuntu-20.04)	4m 25s
std-lib-and-python-virtualenv (ubuntu-20.04, py)	5m 47s
std-lib-and-python-virtualenv (macos-latest, py)	12m 5s
std-lib-and-python-virtualenv (windows-latest, py)	16m 4s
fmt-clippy (windows-latest, default)	7m 58s
fmt-clippy (windows-latest, extra)	6m 38s
fmt-clippy (macos-latest, default)	4m 54s
fmt-clippy (macos-latest, extra)	5m 2s
fmt-clippy (ubuntu-20.04, default)	1m 30s
fmt-clippy (ubuntu-20.04, dataframe)	3m 9s
fmt-clippy (ubuntu-20.04, extra)	2m 54s
tests (windows-latest, default)	19m 58s
tests (macos-latest, default)	17m 9s
tests (ubuntu-20.04, default)	9m 23s
tests (ubuntu-20.04, dataframe)	13m 2s
tests (ubuntu-20.04, extra)	8m 15s
	2h 34m 17s

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