[main] Copy v20.0.1 release notes (#16457)

Signed-off-by: Shlomi Noach <[email protected]>

changelog/20.0/20.0.1/changelog.md

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+# Changelog of Vitess v20.0.1
+
+### Bug fixes 
+#### Cluster management
+ * Fix Downgrade problem from v20 in semi-sync plugin [#16357](https://github.com/vitessio/vitess/pull/16357)
+ * [release-20.0] Use default schema reload config values when config file is empty (#16393) [#16411](https://github.com/vitessio/vitess/pull/16411) 
+#### Docker
+ * [release-20.0] Fix the install dependencies script in Docker (#16340) [#16347](https://github.com/vitessio/vitess/pull/16347) 
+#### Documentation
+ * [release-20.0] Fix the `v19.0.0` release notes and use the `vitess/lite` image for the MySQL container (#16282) [#16286](https://github.com/vitessio/vitess/pull/16286) 
+#### Query Serving
+ * [release-20.0] Fix Incorrect Optimization with LIMIT and GROUP BY (#16263) [#16268](https://github.com/vitessio/vitess/pull/16268)
+ * [release-20.0] planner: Handle ORDER BY inside derived tables (#16353) [#16360](https://github.com/vitessio/vitess/pull/16360)
+ * [release-20.0] fix issue with aggregation inside of derived tables (#16366) [#16385](https://github.com/vitessio/vitess/pull/16385)
+ * [release-20.0] Fix Join Predicate Cleanup Bug in Route Merging (#16386) [#16390](https://github.com/vitessio/vitess/pull/16390)
+ * [release-20.0] Fix panic in user defined aggregation functions planning (#16398) [#16404](https://github.com/vitessio/vitess/pull/16404)
+ * [release-20.0]  Fix panic in schema tracker in presence of keyspace routing rules (#16383) [#16405](https://github.com/vitessio/vitess/pull/16405)
+ * [release-20.0] Fix subquery planning having an aggregation that is used in order by as long as we can merge it all into a single route (#16402) [#16408](https://github.com/vitessio/vitess/pull/16408) 
+#### VReplication
+ * [release-20.0] VReplication: Properly handle target shards w/o a primary in Reshard (#16283) [#16292](https://github.com/vitessio/vitess/pull/16292)
+ * [release-20.0] VDiff: Copy non in_keyrange workflow filters to target tablet query (#16307) [#16315](https://github.com/vitessio/vitess/pull/16315)
+### CI/Build 
+#### Build/CI
+ * [release-20.0] CI: Fix for xtrabackup install failures (#16329) [#16333](https://github.com/vitessio/vitess/pull/16333) 
+#### General
+ * [release-20.0] Upgrade the Golang version to `go1.22.5` [#16323](https://github.com/vitessio/vitess/pull/16323)
+### Internal Cleanup 
+#### Documentation
+ * [release-20.0] Add a note on `QueryCacheHits` and `QueryCacheMisses` in the release notes (#16299) [#16306](https://github.com/vitessio/vitess/pull/16306) 
+#### General
+ * [release-20.0] Update post release `v20.0.0` [#16287](https://github.com/vitessio/vitess/pull/16287)
+### Release 
+#### General
+ * [release-20.0-rc] Bump to `v20.0.1-SNAPSHOT` after the `v20.0.0` release [#16275](https://github.com/vitessio/vitess/pull/16275)
+ * [release-20.0] Bump to `v20.0.1-SNAPSHOT` after the `v20.0.0` release [#16276](https://github.com/vitessio/vitess/pull/16276)
+### Testing 
+#### Query Serving
+ * [release-20.0] fix flaky test TestQueryTimeoutWithShardTargeting (#16150) [#16179](https://github.com/vitessio/vitess/pull/16179)
+ * [release-20] Vitess tester workflow (#16127) [#16417](https://github.com/vitessio/vitess/pull/16417)
+

changelog/20.0/20.0.1/release_notes.md

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+# Release of Vitess v20.0.1
+The entire changelog for this release can be found [here](https://github.com/vitessio/vitess/blob/main/changelog/20.0/20.0.1/changelog.md).
+
+The release includes 21 merged Pull Requests.
+
+Thanks to all our contributors: @GuptaManan100, @app/vitess-bot, @frouioui, @shlomi-noach, @vitess-bot
+

changelog/20.0/README.md

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 ## v20.0
+* **[20.0.1](20.0.1)**
+	* [Changelog](20.0.1/changelog.md)
+	* [Release Notes](20.0.1/release_notes.md)
+
 * **[20.0.0](20.0.0)**
 	* [Changelog](20.0.0/changelog.md)
 	* [Release Notes](20.0.0/release_notes.md)