Draft: Migrate common RTE specs to MSW

Asherah Connorrequested to merge
kiv/migrate-common-rte-specs-to-msw into kiv/initial-msw-tests-for-rte-pte

What does this MR do and why?

Builds on Initial MSW tests for RTE/PTE (!261677).

Migrates the "common" rich-text editor specs to MSW.

TODO

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