feat: add pre-commit check in ci

- add a ci workflow to verify pre-commit passes
- fix pre-commit errors/warnings:
  - missing required_version
  - missing required_providers
  - fixed terraform_deprecated_interpolation
  - removed terraform_unused_declarations

modules/vault_cluster/.tflint.hcl

@@ -0,0 +1,11 @@
+rule "terraform_required_providers" {
+  enabled = false
+}
+
+rule "terraform_required_version" {
+  enabled = false
+}
+
+rule "terraform_unused_declarations" {
+  enabled = false
+}