Support all file endings for Terraform modules

Closes pantsbuild#21506.

It's pretty common to want to include other types of files in a
Terraform module (such as json configuration, sql files and such) and
use them from Terraform by loading them via `file`.

Some examples from the repository I'm currently working on are: .json,
.sql, .zed (SpiceDB schema), so I think it makes sense to allow for any
file extensions here.

src/python/pants/backend/terraform/target_types.py

@@ -30,7 +30,6 @@ class TerraformDependenciesField(Dependencies):
 
 class TerraformModuleSourcesField(MultipleSourcesField):
     default = ("*.tf",)
-    expected_file_extensions = (".tf",)
     ban_subdirectories = True
     help = generate_multiple_sources_field_help_message(
         "Example: `sources=['example.tf', 'new_*.tf', '!old_ignore.tf']`"