build: merge all coverage exclusions into a single command and exclude more files

build: merge all coverage exclusions into a single command and exclude more files

files in the excluded directories either can only be tested with stochastic results
or testing them serves no purpose

pruning these in separate commands adds 10-20s to each coverage build

ref 28f9a5cdb36f01255a94ff8146ee915be506288f
ref T6825

Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>