[roll] Roll fuchsia [heapdump] Compress generated protobuf files

Apart from reducing the resulting file size to 1/8th, this commit
has no user-facing effects, because pprof can transparently open
gzipped protobuf files too.

Note: while pprof can handle both compressed and non-compressed
input files, this CL modifies most of our tests to only accept
compressed files. This works because these tests only run on
just-generated profiles, which will be indeed compressed.

The only exception is dupefinder, as it's a command-line too that
could still in theory be run on input files generated and stored
before this change. Similar to pprof, dupefinder can now accept
both formats.

Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1682394
Original-Original-Revision: ce43c679a10f2bbdb2249684a90b91f305676f36
GitOrigin-RevId: 514c3ffb07f31a66ba9ae566af4d2223a06c4629
Change-Id: If1e776aa7da9396c1c064c0dc508f11caf1195dc
Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1686985
Cr-Commit-Position: refs/heads/main@{#195974}