[ROCM-24669] pkg: drop hsa-rocr dep, warn at install time instead

[thananon]

Fixes ROCM-24669 — amdrocm7-transferbench DEB/RPM declares a hard dependency on hsa-rocr, which ROCm 7.13 no longer ships. Install fails on TheRock 7.13 with Package hsa-rocr is not configured yet.

Summary

• Drop the hard hsa-rocr dep from CPACK_DEBIAN_PACKAGE_DEPENDS, CPACK_RPM_PACKAGE_REQUIRES, and the legacy rocm_package_add_dependencies call. The dep was wrong for the relocatable artifact in general — it ships against the TheRock SDK and is meant to install on systems where ROCm came from a tarball and is not tracked by apt/dpkg at all.
• Add packaging/postinst-check-hsa.sh and wire it as both the DEB postinst (via CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA) and the RPM %post (via CPACK_RPM_POST_INSTALL_SCRIPT_FILE). It probes ldconfig and the standard /opt/rocm{,-*,/extras-*,/core-*}/lib prefixes for libhsa-runtime64.so.1 and prints a stderr warning when none have it. Always exits 0 — install never fails on its account; the warning surfaces a missing runtime at install time instead of as a confusing dynamic-linker error on first invocation.
• numactl / libnuma1 stay in the dep list since those are real OS packages that exist independent of any ROCm install.

Behavior matrix

Scenario	Before	After
TheRock tarball under /opt/rocm/*	install fails (hsa-rocr not in dpkg)	install succeeds, no warning
System apt ROCm with hsa-rocr installed	install succeeds	install succeeds, no warning
Bare system, no ROCm anywhere	install fails	install succeeds with WARNING block to stderr; runtime linker error on first run if user never installs ROCm

Test plan

• CI relocatable build passes on Ubuntu 22.04 (DEB) and manylinux_2_28 (RPM).
• Inspect the produced DEB: dpkg-deb -I amdrocm7-transferbench_*.deb shows Depends: numactl, libnuma1 (no hsa-rocr) and lists a postinst in the control archive.
• Inspect the produced RPM: rpm -qp --requires amdrocm7-transferbench-*.rpm shows only numactl (no hsa-rocr); rpm -qp --scripts shows the %post body.
• Install the DEB on the original ROCm 7.13 / TheRock repro box from the ticket and confirm dpkg -i configures cleanly and TransferBench launches.
• Install the DEB on a bare Ubuntu container with no ROCm and confirm the install succeeds with the warning visible on stderr.