[#442] Remove redundant basicAuth field from datasource.yml

The basicAuth field was unnecessary and redundant under the datasources
section in datasource.yml. Removing this field ensures the configuration
to always parse and be loaded and establishes a cleaner and more concise
configuration file for datasource provisioning in Grafana.

Changes:
- Removed the basicAuth field that was previously present in the
  datasources section of datasource.yml. This field was not needed and
  did not serve any functional purpose. This removal simplifies the
  configuration file and eliminates redundancy.

scripts/govtool/config/templates/grafana-provisioning/datasources/datasource.yml

@@ -78,9 +78,6 @@ datasources:
   # <bool> enable/disable with credentials headers
   withCredentials:
   # <bool> mark as default datasource. Max one per org
-  # <bool> enable/disable basic auth
-  basicAuth: false
-  # <bool> mark as default datasource. Max one per org
   isDefault: false
   version: 1
   # <bool> allow users to edit datasources from the UI.