test(cli): Update tests for latest changes

- Updates pinned Flutter SDK
- Fixes cloud hub build
- Ensure grpc is <4.2.0 (latest version exports Any -- needs changes)

Author: dnys1

.github/workflows/celest_cli.e2e.yaml

@@ -41,6 +41,7 @@ jobs:
         uses: subosito/flutter-action@fd55f4c5af5b953cc57a2be44cb082c8f6635e8e # 2.21.0
         with:
           cache: true
+          channel: beta # Remove when native assets is available in stable
       - name: Setup Deps
         if: runner.os == 'Linux'
         run: tool/setup-ci.sh

.github/workflows/celest_cli.yaml

@@ -43,8 +43,8 @@ jobs:
           cache: true
           # Because many golden tests encode the precise Dart/Flutter SDKs used to generate
           # them, these values must be consistently used when running tests locally and in CI.
-          flutter-version: 3.35.1
-          channel: stable
+          flutter-version: 3.36.0-0.3.pre
+          channel: beta # Remove when native assets is available in stable
       - name: Setup Libsecret
         if: runner.os == 'Linux'
         run: tool/setup-ci.sh