[Breaking Change][lexical-playground]: Refactor: Remove special case for collapsible forward deletion #7204
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Description
Now that we have more robust handling of deleteCharacter around decorators and shadow roots, we can get rid of the expectation that CollapsibleContainerNode does something weird. AFAICT this behavior was a result of the implementation and not something that was specifically intended?
Follow-up to #7155
Related #3082 #4257 https://github.com/facebook/lexical/blame/f5e6329c3773a3e968eeb06a50ae002ce8b1318f/packages/lexical-playground/src/plugins/CollapsiblePlugin/index.ts#L169
Closes #7203
Test plan
Before
Delete forward before a CollapsibleNode would pierce the shadow root and unroll its content at the caret
After
Delete forward before a CollapsibleNode will do nothing, like other shadow roots (e.g. table)