Migrate "update package_files.vue" to GlDisclosure"

What does this MR do and why?

Migrates app/assets/javascripts/packages_and_registries/infrastructure_registry/details/components/package_files.vue from GlDropdown to GlDisclosureDropdown

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

How to set up and validate locally

1. Create a personal access token with the API and write_repository scopes.
2. Download the example Terraform module: terraform-module-local-0.0.3.tgz
3. Upload the module using API:

   curl --fail-with-body --header "PRIVATE-TOKEN: <YOUR_TOKEN>" \
    --upload-file <PATH_TO_FILE> \
    "<YOUR_GDK_LINK>/api/v4/projects/<PROJECT_ID>/packages/terraform/modules/my-module/my-system/0.0.1/file"

4. Visit Operate -> Terraform modules page and select the newly added module.
5. Verify the action dropdown.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #413477 (closed)