Fix up dependencies and build artifacts for reh-web build

[sharon-wang]

Description

• Addresses part of https://github.com/posit-dev/positron/issues/1618 which gets us a binary that is built successfully locally and in CI, the server runs and the client is loaded in the browser, extensions don't really work, but we can select interpreters and execute code in the console
• There are other pieces to work through for the reh-web build: https://github.com/posit-dev/positron/issues/1618#issuecomment-2302425349

QA Notes

There's some issues with extensions, so they are not expected to work yet in the reh-web build. However, Positron should run in a browser, you should be able to select an interpreter and execute code in the console, create plots, use the Data Explorer, etc.

See linked build PR for testing steps.

[sharon-wang]

After pulling in main, I'm having trouble getting a local release build working. Resolving that is in progress 🏗️

Update: opened https://github.com/posit-dev/positron/pull/4438 to resolve the issue.