Add MuteSecurityFindings endpoint spec #17626

Job	Run time
pre-commit / pre-commit	1m 14s
examples / examples	2m 30s
test / test (3.2, ubuntu-latest)	2m 41s
test / test (2.7, ubuntu-latest)	3m 20s
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 32s
report	11s
	13m 28s

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