changelog for v2.178.0

[vEpiphyte]

$ python -m synapse.tools.changelog format  --version v2.178.0 --prs-from-git --rm \
--model-ref ./changes/modelrefs/model_2.177.0_b7da795aeb690020e38e99dc5aa1f505cdc2d659.yaml.gz \
--model-doc-dir ./docs/synapse/userguides/model_updates/ 

No model changes in this release.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.26%. Comparing base (23fdbf7) to head (8b604be).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3846 +/- ## ========================================== - Coverage 96.34% 96.26% -0.09% ========================================== Files 243 243 Lines 54033 54033 ========================================== - Hits 52059 52013 -46 - Misses 1974 2020 +46 ``` | [Flag](https://app.codecov.io/gh/vertexproject/synapse/pull/3846/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject) | Coverage Δ | | |---|---|---| | [linux](https://app.codecov.io/gh/vertexproject/synapse/pull/3846/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject) | `96.26% <ø> (-0.01%)` | :arrow_down: | | [linux_replay](https://app.codecov.io/gh/vertexproject/synapse/pull/3846/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject) | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject#carryforward-flags-in-the-pull-request-comment) to find out more.

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