Check a list of scopes when verifying tokens

[lubosmj]

Before this commit, the registry checked one scope, ignoring other scopes that could relate to blob mounting operations. Due to that, users without sufficient permissions could mount blobs from other users unauthorized.

closes #1286

[ipanova]

i might have used here a boolean instead, but list will work ok too.

[patchback]

Backport to 2.14: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 6658b7e on top of patchback/backports/2.14/6658b7e3d432cc426edf08892d38ed0d27b06692/pr-1340

Backporting merged PR #1340 into main

1. Ensure you have a local repo clone of your fork. Unless you cloned it
   from the upstream, this would be your origin remote.
2. Make sure you have an upstream repo added as a remote too. In these
   instructions you'll refer to it by the name upstream. If you don't
   have it, here's how you can add it:

   $ git remote add upstream https://github.com/pulp/pulp_container.git

3. Ensure you have the latest copy of upstream and prepare a branch
   that will hold the backported code:

   $ git fetch upstream
   $ git checkout -b patchback/backports/2.14/6658b7e3d432cc426edf08892d38ed0d27b06692/pr-1340 upstream/2.14

4. Now, cherry-pick PR Check a list of scopes when verifying tokens #1340 contents into that branch:

   $ git cherry-pick -x 6658b7e3d432cc426edf08892d38ed0d27b06692

   If it'll yell at you with something like fatal: Commit 6658b7e3d432cc426edf08892d38ed0d27b06692 is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 6658b7e3d432cc426edf08892d38ed0d27b06692

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Check a list of scopes when verifying tokens #1340 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/2.14/6658b7e3d432cc426edf08892d38ed0d27b06692/pr-1340

7. Create a PR, ensure that the CI is green. If it's not — update it so that
   the tests and any other checks pass. This is it!
   Now relax and wait for the maintainers to process your pull request
   when they have some cycles to do reviews. Don't worry — they'll tell you if
   any improvements are necessary when the time comes!

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to 2.15: 💚 backport PR created

✅ Backport PR branch: patchback/backports/2.15/6658b7e3d432cc426edf08892d38ed0d27b06692/pr-1340

Backported as #1344

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.