Add LVM test cases

[Vicente-Cheng]

Which issue(s) this PR fixes:

Issue #

What this PR does / why we need it:

Add LVM test case to robot tests

Special notes for your reviewer:

Additional documentation or context

It's based on the PR #2678 (test cases part)

Here is the result:

Running tests with image harvester-robot-tests:6230c6ee
+ docker run -it --rm --user 0:0 -e KUBECONFIG=/kubeconfig -v /tmp/tmp.s0Nw1IDQoD:/harvester-robot-tests/.env:ro -v /root/harvester-dev/kubeconfig:/kubeconfig:ro -v ./reports:/test-output:rw harvester-robot-te
sts:6230c6ee -W -d /test-output -p 3 -f tests/regression/addon/lvm
Loading .env file...
Environment variables loaded from .env
======================================
Harvester Robot Framework Test Runner
======================================
Output: /test-output
Log level: DEBUG
======================================

Running tests...
Initialized logging in /test-output/pabot_results
/usr/lib64/python3.10/runpy.py:126: RuntimeWarning: 'pabot.pabotlib' found in sys.modules after import of package 'pabot', but prior to execution of 'pabot.pabotlib'; this may result in unpredictable behaviour
Storing .pabotsuitenames file
2026-08-09 19:07:49.936448 [PID:20] [0] [ID:0] EXECUTING Lvm.Test Lvm Addon
  warn(RuntimeWarning(msg))
Robot Framework remote server at 127.0.0.1:8270 started.
2026-08-09 19:07:54.943769 [PID:20] [0] [ID:0] still running Lvm.Test Lvm Addon after 5.0s
2026-08-09 19:08:04.959868 [PID:20] [0] [ID:0] still running Lvm.Test Lvm Addon after 15.0s
2026-08-09 19:08:12.984522 [PID:20] [0] [ID:0] PASSED Lvm.Test Lvm Addon in 23.0 seconds
2026-08-09 19:08:13.052144 [PID:66] [0] [ID:1] EXECUTING Lvm.Test Lvm Attach
2026-08-09 19:08:13.057061 [PID:67] [2] [ID:3] EXECUTING Lvm.Test Lvm Expansion
2026-08-09 19:08:13.059730 [PID:71] [1] [ID:2] EXECUTING Lvm.Test Lvm Snapshot
2026-08-09 19:08:18.061481 [PID:66] [0] [ID:1] still running Lvm.Test Lvm Attach after 5.0s
2026-08-09 19:08:18.065626 [PID:67] [2] [ID:3] still running Lvm.Test Lvm Expansion after 5.0s
2026-08-09 19:08:18.067780 [PID:71] [1] [ID:2] still running Lvm.Test Lvm Snapshot after 5.0s
2026-08-09 19:08:28.082246 [PID:66] [0] [ID:1] still running Lvm.Test Lvm Attach after 15.0s
2026-08-09 19:08:28.084118 [PID:67] [2] [ID:3] still running Lvm.Test Lvm Expansion after 15.0s
2026-08-09 19:08:28.085012 [PID:71] [1] [ID:2] still running Lvm.Test Lvm Snapshot after 15.0s
2026-08-09 19:08:43.109176 [PID:67] [2] [ID:3] still running Lvm.Test Lvm Expansion after 30.0s
2026-08-09 19:08:43.110472 [PID:71] [1] [ID:2] still running Lvm.Test Lvm Snapshot after 30.0s
2026-08-09 19:08:43.112858 [PID:66] [0] [ID:1] still running Lvm.Test Lvm Attach after 30.0s
2026-08-09 19:09:03.136559 [PID:67] [2] [ID:3] still running Lvm.Test Lvm Expansion after 50.0s
2026-08-09 19:09:03.136634 [PID:71] [1] [ID:2] still running Lvm.Test Lvm Snapshot after 50.0s
2026-08-09 19:09:03.138360 [PID:66] [0] [ID:1] still running Lvm.Test Lvm Attach after 50.0s
2026-08-09 19:09:11.751117 [PID:67] [2] [ID:3] PASSED Lvm.Test Lvm Expansion in 58.7 seconds
2026-08-09 19:09:26.479630 [PID:66] [0] [ID:1] PASSED Lvm.Test Lvm Attach in 73.4 seconds
2026-08-09 19:09:28.173974 [PID:71] [1] [ID:2] still running Lvm.Test Lvm Snapshot after 75.0s
2026-08-09 19:09:41.808249 [PID:71] [1] [ID:2] PASSED Lvm.Test Lvm Snapshot in 88.7 seconds
2026-08-09 19:09:41.851369 [PID:84] [0] [ID:4] EXECUTING Lvm.Test Zz Lvm Cleanup
2026-08-09 19:09:46.861982 [PID:84] [0] [ID:4] still running Lvm.Test Zz Lvm Cleanup after 5.0s
2026-08-09 19:09:48.770416 [PID:84] [0] [ID:4] PASSED Lvm.Test Zz Lvm Cleanup in 6.9 seconds
5 tests, 5 passed, 0 failed, 0 skipped.
===================================================
Output:  /test-output/output-20260809-190948.xml
Log:     /test-output/log-20260809-190948.html
Report:  /test-output/report-20260809-190948.html
Finalizing Pabot execution...
Stopping PabotLib process
Robot Framework remote server at 127.0.0.1:8270 stopped.
PabotLib process stopped
Total testing: 4 minutes 10.70 seconds
Elapsed time:  1 minute 59.26 seconds
Logs flushed successfully.

======================================
Test Execution Completed
======================================
Exit code: 0
Reports:
  - HTML Report: /test-output/report.html
  - HTML Log: /test-output/log.html
  - XML Output: /test-output/output.xml

✓ All tests passed