fix(k8s): make 'latest' tag parsing logic work correctly

The most recent dev versions of the scylla operator started looking like
the following: 'v1.12.0-alpha.1-78-ge5a1c9b-latest'
Before it was like following: 'v1.12.0-alpha.0-144-g60f7824'

We were depending on the number of the '-' symbols and it now leads to
the filtering out of the new kind of chart versions.
So, fix it by properly checking helm chart versions.

sdcm/cluster_k8s/__init__.py

@@ -552,7 +552,7 @@ def get_latest_chart_version(self, local_chart_path: str) -> str:
         #       in each 'minor' family.
         current_newest_version, current_newest_version_str = None, ''
         for version_object in all_versions:
-            if version_object["version"].count('-') not in (0, 3):
+            if version_object["version"].count('-') == 1:
                 continue
             if ComparableScyllaOperatorVersion(version_object["version"]) > (
                     current_newest_version or '0.0.0'):