All autogenerated qtdbus property fetches are synchronous and not ideal
for Plasma to call.
1) Don't bother checking the protocol version.
If the signals are the same, we may as well try and use the old signals,
if it's not - the signals won't match anything anyway so it won't do
anything anyway.
2) Replace the blocking RegisteredStatusNotifierItem request with an
async variant.
CCBUG: 359611
REVIEW: 127199
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Branched from the monolithic repo kde-workspace, frameworks branch, at commit
049113e719dd2fc4446d054fa1a3aada330094f0