Support both aggregation response shapes for metric tag configurations #19015

Job	Run time
examples / examples	3m 21s
test / test (jruby-9.4.12.0, ubuntu-latest)	4m 9s
pre-commit / pre-commit	1m 28s
test / test (3.2, ubuntu-latest)	3m 41s
test / test (2.7, ubuntu-latest)	3m 29s
report	6s
	16m 14s

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