Use known, subscribed channels in more tests (prep for #1798)#1988

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chrisbobbe wants to merge 7 commits intozulip:mainfrom

chrisbobbe:more-tests-use-subscribed-channels

Commits on Nov 13, 2025

msglist test [nfc]: Fix some test descriptions
chrisbobbe
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msglist test: Switch some model tests to use subscribed channels
chrisbobbe
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msglist test [nfc]: Have prepare-outbox helpers take channel ID not channel
chrisbobbe
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msglist test [nfc]: Support omitting channelId in prepare-outbox helpers
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msglist test: Switch to using eg.defaultStreamMessageStreamId, where boring
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message test: Use known, subscribed channel in sendMessage smoke test
chrisbobbe
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message test: Switch to using eg.defaultStreamMessageStreamId, where boring
chrisbobbe
committed