Modify install_defaults to be more overridable

Due to vars precedence rules, included vars during role runtime can
be overriden only with extra-vars, meaning that defined group/host_vars
will be ignored.

This would fix the usage of group_vars while should work for other
usecases.
Though, `defaults_from` should be supplied explicitly while importing
the role.

Change-Id: I6a213aeaecff87c7e74507c0c2fed9b54c10f908

roles/install_defaults/tasks/main.yml

@@ -1,17 +0,0 @@
----
-# Copyright 2024, Cleura AB.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-- name: Include vars for install method {{ install_method }}
-  include_vars: "{{ install_method }}.yml"