[Bug]: amazon-workspaces is missing the url handler to support SSO login

### Prerequisites - [x] I have written a descriptive issue title. - [x] I have searched all issues/PRs to ensure it has not already been reported or fixed. - [x] I have verified that I am using the latest version of Scoop and corresponding bucket. ### Package Name amazon-workspaces ### Expected/Current Behaviour When the amazon workspaces implementation is configured with SSO in the app you will get a link to open in the web browser and post sign-in, the browser wants to open a custom url handler `workspaces://<auth token>` for this handler to work there are some registry keys that need to be created under `HKEY_CLASSES_ROOT\workspaces` I will create a PR for this. ### Steps to Reproduce ```console Click `Continue to sign in to workspaces` button, log on with sso in your webbrowser and wait for the redirect to bounce you back to amazon workspaces app (which never happens) ``` ### Possible Solution To solve this I will add a add-urlhandler.reg and remove-urlhandler.reg file under the scripts/amazon-workspaces folder and will call these .reg files in the post_install and post_uninstall handler. ### Scoop and Buckets Version ```console Current Scoop version: b588a06e (HEAD -> master, tag: v0.5.3, origin/master, origin/HEAD) chore(release): Bump to version 0.5.3 (resync) (#6436) 'main' bucket: 830c29c68b (HEAD -> master, origin/master, origin/HEAD) vcpkg: Update to version 2026.05.25 'extras' bucket: 9d46e250a8 (HEAD -> master, origin/master, origin/HEAD) zed: Update to version 1.4.4 ``` ### Scoop Config ```console last_update use_lessmsi scoop_branch scoop_repo ----------- ----------- ------------ ---------- 5/28/2026 8:11:09 PM False master https://github.com/lukesampson/scoop ``` ### PowerShell Version ```console Name Value ---- ----- PSVersion 7.6.1 PSEdition Core GitCommitId 7.6.1 OS Microsoft Windows 10.0.22631 Platform Win32NT PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…} PSRemotingProtocolVersion 2.4 SerializationVersion 1.1.0.1 WSManStackVersion 3.0 ``` ### Additional Softwares _No response_