Start removing colour config from `explore` #10096

Job	Run time
plugins (windows-latest)	4m 13s
plugins (macos-latest)	3m 52s
plugins (ubuntu-20.04)	1m 28s
std-lib-and-python-virtualenv (ubuntu-20.04, py)	4m 13s
std-lib-and-python-virtualenv (macos-latest, py)	6m 11s
std-lib-and-python-virtualenv (windows-latest, py)	11m 14s
tests (windows-latest, default)	14m 12s
tests (macos-latest, default)	7m 4s
tests (ubuntu-20.04, default)	5m 50s
tests (ubuntu-20.04, dataframe)	7m 17s
tests (ubuntu-20.04, extra)	5m 28s
fmt-clippy (windows-latest, default)	6m 9s
fmt-clippy (windows-latest, extra)	4m 30s
fmt-clippy (macos-latest, default)	3m 28s
fmt-clippy (macos-latest, extra)	1m 49s
fmt-clippy (ubuntu-20.04, default)	58s
fmt-clippy (ubuntu-20.04, dataframe)	1m 4s
fmt-clippy (ubuntu-20.04, extra)	52s
	1h 29m 52s

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