Ensure setting /adf in the name of the param does not lead to double /adf/adf

**Why?**

If an end-user defines a parameter to `/adf/something`, it would render to
`/adf/adf/something`. This should autofix itself.

Author: sbkok

src/lambda_codebase/initial_commit/bootstrap_repository/adf-build/shared/python/parameter_store.py

@@ -91,9 +91,13 @@ def fetch_parameters_by_path(self, path):
 
     @staticmethod
     def _build_param_name(name, adf_only=True):
-        param_prefix = PARAMETER_PREFIX if adf_only else ''
-        prefix_seperator = '' if name.startswith('/') else '/'
-        return f"{param_prefix}{prefix_seperator}{name}"
+        slash_name = name if name.startswith('/') else f"/{name}"
+        add_prefix = (
+            adf_only
+            and not slash_name.startswith(PARAMETER_PREFIX)
+        )
+        param_prefix = PARAMETER_PREFIX if add_prefix else ''
+        return f"{param_prefix}{slash_name}"
 
     def fetch_parameter(self, name, with_decryption=False, adf_only=True):
         """Gets a Parameter from Parameter Store (Returns the Value)

src/lambda_codebase/initial_commit/bootstrap_repository/adf-build/shared/python/tests/test_parameter_store.py

@@ -5,7 +5,7 @@
 
 import os
 import boto3
-from pytest import fixture
+from pytest import fixture, mark
 from stubs import stub_parameter_store
 from mock import Mock
 
@@ -21,6 +21,39 @@ def cls():
     return cls
 
 
+@mark.parametrize(
+    "input_name, output_path",
+    [
+        ('/adf/test', '/adf/test'),
+        ('adf/test', '/adf/test'),
+        ('/test', '/test'),
+        ('test', '/test'),
+        ('/other/test', '/other/test'),
+        ('other/test', '/other/test'),
+    ],
+)
+def test_build_param_name_not_adf_only(input_name, output_path):
+    assert ParameterStore._build_param_name(
+        input_name,
+        adf_only=False,
+    ) == output_path
+
+
+@mark.parametrize(
+    "input_name, output_path",
+    [
+        ('/adf/test', '/adf/test'),
+        ('adf/test', '/adf/test'),
+        ('/test', '/adf/test'),
+        ('test', '/adf/test'),
+        ('/other/test', '/adf/other/test'),
+        ('other/test', '/adf/other/test'),
+    ],
+)
+def test_build_param_name_adf_only(input_name, output_path):
+    assert ParameterStore._build_param_name(input_name) == output_path
+
+
 def test_fetch_parameter(cls):
     cls.client = Mock()
     cls.client.get_parameter.return_value = stub_parameter_store.get_parameter