Add get package files with revision

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What does this MR do and why?

This MR adds the conan V2 endpoint to get the package files from a package that is also used by V1 with revisions.

Changelog: added

References

• Implement Required Endpoints for Conan v2 Revis... (#519741 - closed)

How to set up and validate locally

1. Switch the conan_package_revisions_support feature flag on.

   For GDK, open rails console (docs):

   gdk rails console

   Enable the feature flag:

   # Enable
   Feature.enable(:conan_package_revisions_support)
   
   # Verify
   Feature.enabled?(:conan_package_revisions_support)

2. Get Conan Authentication Token

   First, generate a base64-encoded Basic Auth token:

   # Replace with your username and PAT
   echo -n "USERNAME:glpat-YOUR-TOKEN"|base64

   Then use the output to get a Conan JWT token:

   curl --request GET \
   --url 'http://localhost:3000/api/v4/projects/<project_id>/packages/conan/v1/users/authenticate' \
   --header 'Authorization: Basic <YOUR-BASE64-TOKEN>'

3. Make sure there are two package files uploaded.

   Create two package files:

   echo "info" > "conaninfo.txt"
   echo "1744016993" > "conanmanifest.txt"

   Upload the two files:

   curl --request PUT \
        --upload-file conaninfo.txt \
        --url 'http://localhost:3000/api/v4/projects/<project_id>/packages/conan/v2/conans/packagefiles/1.0.0/user/stable/revisions/123456789012345678901234567890ab/packages/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/revisions/3bdd2d8c8e76c876ebd1ac0469a4e72c/files/conaninfo.txt' \
        --header 'Authorization: Bearer <YOUR-CONAN-JWT-TOKEN>'
   
   curl --request PUT \
        --upload-file  conanmanifest.txt \
        --url 'http://localhost:3000/api/v4/projects/<project_id>/packages/conan/v2/conans/packagefiles/1.0.0/user/stable/revisions/123456789012345678901234567890ab/packages/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/revisions/3bdd2d8c8e76c876ebd1ac0469a4e72c/files/conanmanifest.txt' \
        --header 'Authorization: Bearer <YOUR-CONAN-JWT-TOKEN>'

4. Call the get package files endpoint

   curl --request GET \
        --url 'http://localhost:3000/api/v4/projects/<project_id>/packages/conan/v2/conans/packagefiles/1.0.0/user/stable/revisions/123456789012345678901234567890ab/packages/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/revisions/3bdd2d8c8e76c876ebd1ac0469a4e72c/files' \
        --header 'Authorization: Bearer <YOUR-CONAN-JWT-TOKEN>'

   that should return status 200 OK and body:

   { "files": { "conaninfo.txt": {}, "conanmanifest.txt": {} } }

/cc @oceane_scania

Related to #519741 (closed)