Bulk delete package files

What does this MR do and why?

Adds ability for project Maintainer/Owner to delete multiple package files.

• Also fixes minor issue where file name is missing in modal when deleting a single file.
• Removes graphql mutation destroyPackageFile and use destroyPackageFiles instead
• Added minimal loading handling, full loading changes to be handled by Package details page: add loader for Files comp... (#365232 - closed)

Screenshots or screen recordings

action	screen recording
select/unselect all	select_all_unselect_all
delete file	delete_file
delete file using 'Delete Selected'	delete_file_checkbox
delete multiple files	delete_multiple_files
delete 100 files	delete_files_one_page
delete package	delete_package

How to set up and validate locally

• Create/choose a project have you have permission to delete packages.
• Follow instructions to publish package with files https://gitlab.com/gitlab-org/ci-cd/package-stage/package/-/wikis/Packages-Tips-&-Tricks#how-to-create-n-files-for-generic-package
• Visit package registry detail page
• Test deleting one package file(selecting the checkbox, selecting the action menu), multiple files & all files.
• Confirm that features are not available for users without permission.

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.

Closes #336797 (closed)