Consolidate modelm v2 (#14996)

Co-authored-by: Ryan <[email protected]>
Co-authored-by: Nick Brassel <[email protected]>

docs/ChangeLog/20230528/PR14996.md

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+# QMK Breaking Changes - 2023 May 28 Changelog
+
+## Notable Features :id=notable-features
+
+### Consolidate modelm ([#14996](https://github.com/qmk/qmk_firmware/pull/14996)
+
+Several build targets for the IBM Model M were cluttered in different folders.
+The maintainers of several Model M replacement controller projects agreed to
+consolidate them under one common folder.
+
+List of the consolidations now in keyboards/modelm/:
+
+- ashpil_usbc 
+- ibm122m
+- mschwingen
+- teensy2 (renamed from modelm101_teensy2)
+- teensypp (renamed from modelm101)
+- teensypp_ssk (renamed from modelm_ssk)
+- ibm122m
+- m122_3270
+- yugo_m