ceph-volume: do not convert LVs's symlink to real path

ceph-volume: do not convert LVs's symlink to real path

This commit:
- Adds a new function `get_lvm_mappers` in `ceph_volume/util/disk.py`
  to retrieve a list of LVM device mappers.
- Updates the `is_lv` property in `ceph_volume/util/device.py`
  to use the new `get_lvm_mappers` function for better accuracy.
- Modifies the symlink handling in `Device` class to properly
  identify LVM logical volumes.
- Adds a new test `test_reject_lv_symlink_to_device` to ensure
  LVM symlinks are correctly identified and handled.
- Updates relevant tests to cover the changes in LVM device detection.

These changes improve the reliability and accuracy of LVM device detection
and handling, ensuring that symlinks to LVM logical volumes are
correctly processed.

Fixes: https://tracker.ceph.com/issues/61597
Signed-off-by: Guillaume Abrioux <gabrioux@ibm.com>
Co-Authored-by: Jerry Pu <jerrypu@qnap.com>
(cherry picked from commit 729c5de4f852f1a1ee90e76b71157e9070af7d99)