Fixes#12789
Adds a new query endpoint to Navigator's GraphQL backend that
lists all the parties registered by Navigator. The parties are
filtered on the server based on a query from the frontend and
served back. The frontend uses this to provide suggestion and
autocompletion features whenever a party identifier input is
required.
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[Navigator] Whenever you have to input a party identifier you
are now offered suggestions and the possibility to
autocomplete. See #12789.
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