Support WebAssembly in Qt Cloud

Qt 6.4 is planned to have WebAssembly fully suppported as a hero feature of the release. this means also CI unit testing as well as RTA being continuously done.

There could also be significant synergies with the WebAssembly initiatives and Qt Cloud, hence this ticket tracks the work item of supporting WebAssembly in Qt Cloud CI/CD pipeline, also in conjunction of new initiatives for a combined offering with Qt Cloud, end user analytics, design-develop-test workflow using QML and new cloud-based business models.