Prepare release 0.35.0 (#1217)

Prepare release 0.35.0, mostly containing small fixes and an election
refactor.

[skip ci]

release rivertype/v0.35.0

release rivershared/v0.35.0

release riverdriver/v0.35.0

release riverdriver/riversqlite/v0.35.0

release riverdriver/riverpgxv5/v0.35.0

release riverdriver/riverdatabasesql/v0.35.0

release cmd/river/v0.35.0

Prepare version 0.34.0 (#1202)

I just realized that my `TestSchemaOpts.DisableReuse` option didn't make
it into the last release and I'm trying to get it so I can clean up some
Pro tests. Here, cut version 0.34.0 to capture this change a number of
others that've come in recently.

[skip ci]

release rivertype/v0.34.0