Avoid "stream not found" log message when it is expected

[alexeyzimarev]

Command services support executing a command with expected stream version Any. However, the store still produces a log message when it reads a non-existent stream.
This PR makes the log message disappear along with the exception, if it is expected that there's no stream. Stores should return an empty result when the stream is not found.

[github-actions]

Test Results

 28 files  + 14   28 suites  +14   1h 21m 1s ⏱️ + 53m 23s
193 tests +  1  193 ✅ +  1  0 💤 ±0  0 ❌ ±0 
388 runs  +194  388 ✅ +194  0 💤 ±0  0 ❌ ±0 

Results for commit ea7f472. ± Comparison against base commit e4769af.

This pull request removes 1 and adds 2 tests. Note that renamed tests count towards both.

Eventuous.Tests.Subscriptions.SequenceTests ‑ ShouldReturnFirstBefore(CommitPositionSequence, CommitPosition { Position: 0, Sequence: 2, Timestamp: 2025-01-30T09:25:09.0819222+00:00 })

Eventuous.Tests.Subscriptions.SequenceTests ‑ ShouldReturnFirstBefore(CommitPositionSequence, CommitPosition { Position: 0, Sequence: 2, Timestamp: 2025-03-03T16:49:14.1935502+00:00 })
Eventuous.Tests.Subscriptions.SequenceTests ‑ ShouldReturnFirstBefore(CommitPositionSequence, CommitPosition { Position: 0, Sequence: 2, Timestamp: 2025-03-03T16:49:25.2561705+00:00 })

♻️ This comment has been updated with latest results.