[bug]: FILSnap@2.3.5 broken in prod

[rekmarks]

Describe the bug

The MetaMask team noticed that FILSnap@2.3.5 cannot be installed because the path fields in its snap.manifest.json are prefixed with ./. This is not permitted by the manifest specification.

We are nevertheless going to permit this for Snaps published to npm in the future, and this change will be included in a release Soon(TM). That said, the quickest way to fix this is probably to fix the manifest fields and re-release the snap.

To Reproduce

1. Ensure that FILSnap is not installed in your current instance of MetaMask Flask
2. Go to https://filsnap.chainsafe.io/
3. Attempt to install FILSnap
4. Notice that installation fails

Relevant log output

n/a

Expected behavior

Installation should work.

Additional context

n/a

[mpetrunic]

@rekmarks should this check be added to snaps-cli validate manifest command?