Correct pywinrm distribution name in HAS_WINRM detection (salt-cloud WinRM)

[fudianchn]

Problem

salt-cloud Windows deployments with use_winrm: true always fail with

[ERROR ] WinRM requested but module winrm could not be imported.
Ensure you are using version 0.3.0 or higher.

even when pywinrm (>= 0.3.0) is installed (#69976).

Root cause is in the HAS_WINRM detection block of salt/utils/cloud.py:

version = importlib.metadata.version("winrm")   # wrong distribution name

The PyPI package is distributed as pywinrm (imported as winrm). importlib.metadata.version("winrm") raises PackageNotFoundError, which is a subclass of ImportError, so the surrounding except ImportError: swallows it and HAS_WINRM is left False unconditionally.

Fix

Use the correct distribution name:

-    version = importlib.metadata.version("winrm")
+    version = importlib.metadata.version("pywinrm")

Notably the existing test_winrm_pinnned_version already queries version("pywinrm"), so the test suite was using the right name while the source wasn't.

Verification

Reproduced the detection logic directly (Python 3.12, pywinrm 0.5.0 installed):

lookup 'winrm'  -> raises PackageNotFoundError (subclass of ImportError) -> HAS_WINRM = False  (bug)
lookup 'pywinrm' -> '0.5.0'                                                -> HAS_WINRM = True   (fixed)

Added a regression test (test_has_winrm_detection_uses_pywinrm_distribution) that asserts salt.utils.cloud.HAS_WINRM is True when pywinrm is installed (skips otherwise) — it fails with the old "winrm" lookup and passes after the fix.

Closes #69976