Remove cursor support from SubscribeAllEnvelopes

[Maelkum]

As mentioned here the amount of data one could unintentionally stream is too large, so we're removing cursor support for "stream all".

Technically correct would be to have the reserve 1; directive, but this change was not really released and no one really relies on it so no breaking changes should happen.

Note

Remove last_seen cursor field from SubscribeAllEnvelopesRequest

Removes the last_seen cursor field from the SubscribeAllEnvelopesRequest proto message in message_api.proto, leaving it empty. Risk: callers that set or read last_seen will break; serialized requests that previously included a cursor will now be empty.

^{Macroscope summarized 21efdc8.}

[macroscopeapp]

Approvability

Verdict: Approved

Simple proto schema change removing cursor support from SubscribeAllEnvelopesRequest. The author is the designated code owner of the modified file and a repo admin, indicating appropriate authority to make this API design decision.

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