The name IPC service is not very descriptive. By nature of being
separate processes, we need to use IPC to communicate between them. The
important thing is that the service process has control over the tunnel.
Therefore, we rename everything to "Tunnel service".
The only part that is not changed are historic changelog entries.
Resolves: #9048
In #7795, we optimised our CI pipeline to only test the installation of
the GUI client whenever we actually upload to the draft release. This
trigger has been moved to `workflow_dispatch`, meaning no CI builds
neither from PRs nor `main` perform these steps.
This makes it difficult to test GUI client binaries from PRs because
they also no longer get uploaded to the artifacts of the CI run on the
PR.
To fix this, we split the testing away from the rename script and
unconditionally run the rename script, which allows us to also always
upload the binaries to the CI artifacts.
Finally, uploading to the draft releases is only done when we explicitly
trigger the workflow from `main`. This is a defense-in-depth measure: We
should never publish a code to a release that hasn't been merged to
`main`.
