Release 22.0.0 as stable (non-alpha) (#1137)

* Initial plan

* chore: release 22.0.0 as stable (non-alpha)

Agent-Logs-Url: https://github.com/fsprojects/FSharp.Formatting/sessions/9bb7c345-241e-4ac6-b922-bd638adbcd9a

Co-authored-by: dsyme <7204669+dsyme@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: dsyme <7204669+dsyme@users.noreply.github.com>
Co-authored-by: Don Syme <dsyme@users.noreply.github.com>
Co-authored-by: Florian Verdonck <florian.verdonck@outlook.com>

Author: 3 people

RELEASE_NOTES.md

@@ -2,7 +2,7 @@
 
 ## [Unreleased]
 
-## [22.0.0-alpha.3] - 2026-04-02
+## [22.0.0] - 2026-04-03
 
 ### Fixed
 * Fix spurious `'fsi' is not defined` error during literate script type-checking when scripts use `fsi.AddPrinter` or related APIs. The `FSharp.Compiler.Interactive.Settings.dll` reference is now explicitly added to the type-checker options. [#1139](https://github.com/fsprojects/FSharp.Formatting/issues/1139)