fix(tests): use fireEvent to simulate open/close of the palette #4971

Job	Run time
build	3m 55s
setup-matrix	3s
lint	2m 22s
test	2m 12s
e2e (1, ../ui/collections/forms/src/CheckboxFieldFF/features/can_toggle_a_boolean.feature, ../ui/...	5m 48s
e2e (2, ../ui/collections/forms/src/CheckboxFieldFF/features/can_toggle_a_value.feature, ../ui/co...	5m 21s
e2e (3, ../ui/collections/forms/src/CheckboxFieldFF/features/displays_error.feature, ../ui/collec...	5m 21s
e2e (4, ../ui/collections/forms/src/FileInputFieldFF/features/accepts_file.feature, ../ui/collect...	5m 0s
e2e (5, ../ui/collections/forms/src/FileInputFieldFF/features/displays_error.feature, ../ui/colle...	5m 31s
e2e (6, ../ui/collections/forms/src/InputFieldFF/features/can_set_a_value.feature, ../ui/collecti...	5m 25s
e2e (7, ../ui/collections/forms/src/InputFieldFF/features/displays_error.feature, ../ui/collectio...	5m 19s
publish	1m 16s
	47m 33s

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