fix: scope rpm-sequoia workaround to RHEL 10+ and handle repo errors

[sshmulev]

Summary

• The ensure_rpm_usable_before_tests fixture was causing 29 test Errors on RHEL 9.x and 26 test Errors on RHEL 10.2 in Jenkins CIV runs
• Root cause: the fixture runs yum -y update rpm-sequoia openssl-libs on all RHEL versions, but rpm-sequoia only exists on RHEL 10. On RHEL 9, the command fails because RHUI repos return 404, and the error handling only caught 403 and not registered patterns
• Fix: skip the workaround entirely on non-RHEL-10, and on RHEL 10 handle 404 and not installed errors gracefully in addition to the existing 403/not registered handling

Test plan

• Deployed a RHEL 9.8 HA Azure VM (rhel-ha-azure-9.8-20260908.3.x86_64.vhd) and ran the full CIV test suite
• Confirmed 0 Errors (was 29) — all 86 tests collected and ran
• Remaining 8 failures are legitimate test issues (broken RHUI repo codeready-builder-for-rhel-9-x86_64-eus-rhui-rpms returning 404, missing RHUI cert, GPG key mismatch, etc.)

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="test_suite/conftest.py" line_range="204" />
<code_context>
         print("\n[!] OCI instance: skipping RHUI RPM workaround.")
         return

+    if not host.system_info.release.startswith("10"):
+        print(f"\n[!] RHEL {host.system_info.release}: rpm-sequoia not applicable, skipping workaround.")
+        return
</code_context>
<issue_to_address>
**nitpick (bug_risk):** The `startswith("10")` check is not an RHEL 10+ check: it skips RHEL 11 and later releases, while it still runs the workaround on any non-RHEL distribution whose release begins with `10` (for example, CentOS Stream 10). The fixture therefore does not match the documented scope.

**Triggers:** When a RHEL 11+ host or a non-RHEL 10 host runs the test suite.

**Suggested fix:** Parse the release major version and require `host.system_info.distribution == "rhel"` with `version.parse(host.system_info.release).major >= 10`.

```suggestion
    if host.system_info.distribution != "rhel" or version.parse(host.system_info.release).major < 10:
```
</issue_to_address>

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