[cloud] Provide ability to disable executing modified pxl scripts #2217

Job	Run time
env-protect-setup	27s
authorize	1s
get-dev-image / get-image	6s
clang-tidy	1m 17s
generate-matrix	3m 13s
code-coverage	0s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	2m 40s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	2m 41s
build-and-test-status	1s
	10m 26s

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