Remove hcl2 python dependency (#3836)

* Migrate organization policy tests to standard tftest.yaml.

Remove python-hcl2 dependency and the custom python test file.
Consolidate the boolean, list, and custom constraint tests into a single `org_policies` test with a factory equivalent.
Restructure factory files into a unified `factory/` directory.

* Migrate project and folder org policy tests to standard tftest.yaml.

Replicate the organization module changes for project and folder modules:
- Remove python-hcl2 dependency usages and conftest.py.
- Remove custom python test files for org policies.
- Consolidate org policy tests into a single `org_policies` test with a factory equivalent.
- Unify factory files into a `factory/` directory.
- Remove redundant common.tfvars in folder module.

* Add factory policies directory to duplicate-diff checks.

Ensure the YAML factory files for org policies remain perfectly identical across the organization, folder, and project modules.

* Remove unused deepdiff dependency from requirements and pre-commit config.

* Add boilerplate

* fix broken link

.pre-commit-config.yaml

@@ -31,7 +31,6 @@ repos:
     language: python
     additional_dependencies:
     - click
-    - deepdiff
     - ghapi
     - iso8601
     - marko
@@ -49,7 +48,6 @@ repos:
     entry: tools/check_boilerplate.py
     additional_dependencies:
     - click
-    - deepdiff
     - ghapi
     - iso8601
     - marko
@@ -66,7 +64,6 @@ repos:
     language: python
     additional_dependencies:
     - click
-    - deepdiff
     - ghapi
     - iso8601
     - marko
@@ -89,7 +86,6 @@ repos:
     language: python
     additional_dependencies:
     - click
-    - deepdiff
     - ghapi
     - iso8601
     - marko
@@ -105,7 +101,6 @@ repos:
     language: python
     additional_dependencies:
     - click
-    - deepdiff
     - ghapi
     - iso8601
     - marko
@@ -121,7 +116,6 @@ repos:
     language: python
     additional_dependencies:
     - click
-    - deepdiff
     - ghapi
     - iso8601
     - marko