Vite embedded build of Element Call (#3077)

* Embedded package build of Element Call

Part of https://github.com/element-hq/element-call/issues/2994

This creates a new "embedded" build (vs "full" build) at the vite level. It will be used by a later PR that actually provides platform specific packages.

Embedded build:

- Uses relative URLs
- Uses relative config.json path and other resource loading
- Has a config.json built in
- Doesn't include the public folder (e.g. favicon)

Out of scope:

- this doesn't attempt to exclude SPA functionality, so technically the build could be used in SPA
- the above means that the crypto-wasm binary is included in the build

* CI artifact name based on type of build

* Update src/config/Config.ts

.github/workflows/publish.yaml

@@ -13,6 +13,7 @@ jobs:
     if: ${{ github.event_name == 'release' }}
     uses: ./.github/workflows/build-element-call.yaml
     with:
+      package: full
       vite_app_version: ${{ github.event.release.tag_name || github.sha }}
     secrets:
       SENTRY_ORG: ${{ secrets.SENTRY_ORG }}
@@ -38,7 +39,7 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           run-id: ${{ github.event.workflow_run.id || github.run_id }}
-          name: build-output
+          name: build-output-full
           path: dist
       - name: Create Tarball
         env: