Allow hostname to be provided with or without a trailing slash (#784)

* Ignore trailing / in host name

The trailing / is often added automatically when copy pasting
Before this change, you would get "Database Error - failed to connect"

After this change, the trailing backslash won't prevent your connection

* Update changelog

---------

Co-authored-by: colin-rogers-dbt <111200756+colin-rogers-dbt@users.noreply.github.com>

.changes/unreleased/Fixes-20230623-112100.yaml

@@ -0,0 +1,6 @@
+kind: Fixes
+body: Allow hostname to be provided with or without trailing slash
+time: 2023-06-23T11:21:00.901430172Z
+custom:
+  Author: tim-steinkuhler
+  Issue: "302"

dbt/adapters/spark/connections.py

@@ -139,6 +139,9 @@ def __post_init__(self) -> None:
                     f"ImportError({e.msg})"
                 ) from e
 
+        if self.method != SparkConnectionMethod.SESSION:
+            self.host = self.host.rstrip("/")
+
     @property
     def type(self) -> str:
         return "spark"