Testing: Fix driver installation on Rocky Linux 9

[LujieDuan]

Description

This PR contains the following changes to the centeo_rhel's dcgm and nvml install scripts:

1. For the package manager installation method - update the temporary fix introduced by b/330327505 (Testing: Fix GPU driver installation on SLES 15 and Rocky Linux 9 #1657 ). The Rocky Linux 9 image has been updated to kernel 5.14.0-362.24.1.el9_3.0.1.x86_64. Unfortunately the NVIDIA driver still tries to check /lib/modules/5.14.0-362.24.1.el9_3.x86_64 so has to do the softlink fix. But the latest driver (550) does have the kmod for 362.24.1, so we can remove the logic sudo yum -y module install nvidia-driver:545 and sudo yum -y install cuda-12-3.
2. For the runfile installation method: for Rocky Linux 9, we setup the repo entry manually to the Rocky Vault repo (archive repo), so that we can get a previous version of kernel-devel package. A matching kernel-devel package is needed to compile the driver. We don't need to do this for Rocky Linux 8 (for now) - historically the regular RL8 repo would keep a couple of recent versions of the package, which works with the GCE RL 8 image releasing cycles.
3. For the runfile installation method: update to install the latest version (550). The previous driver issue with 535 (building main against current centos stream 8 fails NVIDIA/open-gpu-kernel-modules#550) has been resolved in 550, so we can install the driver and CUDA toolkit together. Remove the extra logic.

Related issue

b/340200529

How has this been tested?

Tested to make sure install_cuda_from_package_manager and install_cuda_from_runfile work for centos7, rl8 and rl9.

Checklist:

• Unit tests
  • Unit tests do not apply.
  • Unit tests have been added/modified and passed for this PR.
• Integration tests
  • Integration tests do not apply.
  • Integration tests have been added/modified and passed for this PR.
• Documentation
  • This PR introduces no user visible changes.
  • This PR introduces user visible changes and the corresponding documentation change has been made.
• Minor version bump
  • This PR introduces no new features.
  • This PR introduces new features, and there is a separate PR to bump the minor version since the last release already.
  • This PR bumps the version.

[LujieDuan]

The RL9 image has been updated to 9.4 (5.14.0-427.16.1.el9_4.x86_64).
The nightly is passing now with the new image without this PR.
Will update this PR to remove the temporary fix since the new image doesn't need that anymore.