fix: manifest handling improvements (gruntwork-io#6032)

* bug: improved manifet handling

* bug: improved manifest handling

* chore: cleanup function update

* chore: simplified cleanup directory

* chore: changelog updates

* chore: download source simplification

* chore: download source simplifications

* chore: manifests handling simplification

* chore: snapshot handling simplification

* chore: download source cleanup

* chore: cleanup simplification

* chore: files cleanup

* chore: download source update

* chore: walk dir cleanup

* chore: extended manifests handling

* chore: manifests cleanup

* chore: manifests cleanup

* chore: improved manifest handling

* chore: simplified version setup

* chore: utils simplification

* chore: PR comments

* chore: PR comments

* chore: reading simplifications

* chore: vfs simplifications

* chore: PR cleanup

* chore: tests cleanup

* chore: options simplification

* chore: PR comments update

* chore: added type structs

* chore: fixing failing tests

Author: denis256

docs/src/data/changelog/v1.0.4/manifest-handling.mdx

@@ -0,0 +1,8 @@
+---
+version: "v1.0.4"
+category: "bug-fixes"
+---
+
+#### Hardened module manifest handling
+
+Terragrunt now bounds `.terragrunt-module-manifest` cleanup to the manifest's own folder, skips paths with symlinked parents, and removes invalid manifests after reading any valid entries. Existing manifests keep the same gob format.