feat: enable coverage linter for functional tests #1327

Job	Run time
Build Image	28s
Build Dependencies (arm-linux, arm-linux-gnueabihf)	1m 13s
Build Dependencies (linux64, x86_64-pc-linux-gnu)	1m 21s
Build (arm-linux, arm-linux-gnueabihf, arm-linux)	4m 17s
Build (linux64, x86_64-pc-linux-gnu, linux64)	7m 6s
Build (linux64_tsan, x86_64-pc-linux-gnu, linux64)	11m 42s
Build (linux64_ubsan, x86_64-pc-linux-gnu, linux64)	7m 56s
Build (linux64_fuzz, x86_64-pc-linux-gnu, linux64)	14m 34s
Build (linux64_cxx20, x86_64-pc-linux-gnu, linux64)	7m 27s
Build (linux64_sqlite, x86_64-pc-linux-gnu, linux64)	4m 37s
Build (linux64_nowallet, x86_64-pc-linux-gnu, linux64)	7m 22s
	1h 8m 3s

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