Tweak logging for when a worker waits for its view of a replication stream to...

Tweak logging for when a worker waits for its view of a replication stream to catch up. (#15120)Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

* Improve logging messages for the 'wait for repl stream' read-after-write consistency feature

* Newsfile

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>

* Update synapse/replication/tcp/client.py

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

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Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>
Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>