Add yum check for rclone installation

[EricBryann]

PR to fix #6567

When dpkg runs into an error, the code defaults to yum, and some don't have yum installed, resulting in
sudo: yum: command not found

This PR checks for existence of yum before rclone install

Tested (run the relevant ones):

• Code formatting: install pre-commit (auto-check on commit) or bash format.sh
• Any manual or new tests for this PR (please specify below)
• All smoke tests: /smoke-test (CI) or pytest tests/test_smoke.py (local)
• Relevant individual tests: /smoke-test -k test_name (CI) or pytest tests/test_smoke.py::test_name (local)
• Backward compatibility: /quicktest-core (CI) or pytest tests/smoke_tests/test_backward_compat.py (local)

[kevinmingtarja]

Thanks for the contribution @EricBryann!

Let's add a smoke test on AWS for this :)

Some pointers:

• rclone is needed only with MOUNT_CACHED mode (or on arm64 arch),
• So you can copy test_kubernetes_storage_mounts_cached as a starting point
• Let's test with two different AMIs that are different linux distros, one with dpkg, the other with yum. We can take ubuntu and amazon linux 2023 for example

[kevinmingtarja]

/smoke-test -k storage_mounts_cached --aws

[kevinmingtarja]

/smoke-test

[kevinmingtarja]

/smoke-test -k storage --aws
/smoke-test -k storage --gcp
/smoke-test -k storage --kubernetes

[kevinmingtarja]

/smoke-test -k test_aws_storage_mounts_cached --aws

[kevinmingtarja]

/smoke-test -k test_aws_storage_mounts_cached

[kevinmingtarja]

The two test failures are unrelated, fixed by #7818.

[kevinmingtarja]

LGTM, thanks for the contribution @EricBryann ! Just left one nit.

[kevinmingtarja]

Nit: Could we keep the aws ec2 describe-images ... commands comment that you had in the prev commit here for future reference.

[kevinmingtarja]

/smoke-test -k storage --nebius

[kevinmingtarja]

/smoke-test -k storage --azure