Add `collect_heap_pprofs.sh` script for easier collection of heap profiles #2471

Job	Run time
env-protect-setup	6s
authorize	1s
get-dev-image / get-image	4s
clang-tidy	1m 14s
generate-matrix	4m 4s
code-coverage	0s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	2m 53s
build-and-test-status	1s
	8m 23s

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