PORT - Port document dispose fix to release. (#4798)

* Only clean up editors on close not on Panel dispose (#4787)

* update changelog

Co-authored-by: Ian Huff <ianhuff@LICHYOGAIOT.northamerica.corp.microsoft.com>

CHANGELOG.md

@@ -101,6 +101,8 @@
    ([#4713](https://github.com/Microsoft/vscode-jupyter/issues/4713))
 1. If .NET interactive is installed, make sure to use the new notebook editor.
    ([#4771](https://github.com/Microsoft/vscode-jupyter/issues/4771))
+1. Only clean up a notebook editor when it's closed, not when the panel is disposed.
+   ([#4786](https://github.com/Microsoft/vscode-jupyter/issues/4786))
 1. Fixes problem with duplicate jupyter kernels being generated.
    ([#4720](https://github.com/Microsoft/vscode-jupyter/issues/4720))