Remove deprecated allocation key fields from feature flags API #17623

Job	Run time
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 12s
test / test (3.2, ubuntu-latest)	3m 3s
pre-commit / pre-commit	1m 17s
test / test (2.7, ubuntu-latest)	3m 26s
examples / examples	2m 50s
report	9s
	13m 57s

Provide feedback