Remove pipes usage when reading the manifest file in collect_cc_coverage.sh
Remove pipes usage when reading the manifest file in collect_cc_coverage.sh

Replace reading the manifest using pipes with `read -r`. Using pipes is not an efficient way to read big files.

I created a small repo that only reads:
* a 200.000-lines file:
with pipes: 0m7.965s
with read:  0m2.835s
* a 2.000.000-lines file:
with pipes: 1m21.065s
with read:  0m29.215s

Closes #8331.

PiperOrigin-RevId: 248528367

aehlig/bazel,safarmer/bazel,davidzchen/bazel,davidzchen/bazel,ButterflyNetwork/bazel,safarmer/bazel,cushon/bazel,meteorcloudy/bazel,werkt/bazel,dslomov/bazel-windows,perezd/bazel,werkt/bazel,katre/bazel,cushon/bazel,perezd/bazel,safarmer/bazel,akira-baruah/bazel,katre/bazel,bazelbuild/bazel,bazelbuild/bazel,ulfjack/bazel,aehlig/bazel,safarmer/bazel,perezd/bazel,twitter-forks/bazel,twitter-forks/bazel,cushon/bazel,werkt/bazel,ulfjack/bazel,katre/bazel,aehlig/bazel,safarmer/bazel,aehlig/bazel,twitter-forks/bazel,dslomov/bazel-windows,meteorcloudy/bazel,bazelbuild/bazel,dslomov/bazel,dslomov/bazel-windows,perezd/bazel,ulfjack/bazel,ButterflyNetwork/bazel,katre/bazel,ulfjack/bazel,werkt/bazel,twitter-forks/bazel,davidzchen/bazel,meteorcloudy/bazel,perezd/bazel,dslomov/bazel,dslomov/bazel,bazelbuild/bazel,akira-baruah/bazel,ulfjack/bazel,twitter-forks/bazel,cushon/bazel,twitter-forks/bazel,meteorcloudy/bazel,dslomov/bazel-windows,safarmer/bazel,davidzchen/bazel,werkt/bazel,bazelbuild/bazel,ulfjack/bazel,perezd/bazel,dslomov/bazel,davidzchen/bazel,bazelbuild/bazel,aehlig/bazel,ulfjack/bazel,dslomov/bazel,dslomov/bazel-windows,ButterflyNetwork/bazel,katre/bazel,akira-baruah/bazel,davidzchen/bazel,werkt/bazel,davidzchen/bazel,akira-baruah/bazel,dslomov/bazel-windows,cushon/bazel,akira-baruah/bazel,akira-baruah/bazel,meteorcloudy/bazel,dslomov/bazel,meteorcloudy/bazel,katre/bazel,cushon/bazel,dslomov/bazel,meteorcloudy/bazel,ButterflyNetwork/bazel,aehlig/bazel,ButterflyNetwork/bazel,aehlig/bazel,twitter-forks/bazel,perezd/bazel,ButterflyNetwork/bazel