Remove gateway sorting

[mkysel]

Remove gateway_time from SQL ordering and order gateway envelope queries by originator_node_id and originator_sequence_id in envelopes_v2.sql

Update SQL CTE ORDER BY to drop gateway_time and sort by originator_node_id, originator_sequence_id; regenerate code and add a test asserting contiguous sequences per originator.

📍Where to Start

Start with the SelectGatewayEnvelopesByOriginators and SelectGatewayEnvelopesByTopics queries in envelopes_v2.sql, then review the regenerated code in envelopes_v2.sql.go and the test in subscription_test.go.

Changes since #1468 opened

• Updated expected row indices in TestQueryPagedEnvelopes test assertion [e266456]
• Applied formatting change to checkRowsMatchProtos helper function [e266456]
• Applied formatting adjustment to test helper function [2266b39]

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Macroscope summarized 172b3fb.

[mkysel]

Fixes #1421

[mkysel]

will add tests