fix: Make keys for local.projects consistent (#2516)

Projects configured in `folders_data_path` have their filename as key, whereas those from `projects_data_path` have their path, relative to `projects_data_path` as key.
This causes different behavior when defining `local.projects` and subsequently calling `module.projects`, unless `name` is specified.

modules/project-factory/factory-projects.tf

@@ -31,7 +31,7 @@ locals {
   _projects = merge(
     {
       for f in try(fileset(local._project_path, "**/*.yaml"), []) :
-      trimsuffix(f, ".yaml") => yamldecode(file("${local._project_path}/${f}"))
+      basename(trimsuffix(f, ".yaml")) => yamldecode(file("${local._project_path}/${f}"))
     },
     local._hierarchy_projects
   )