[release/7.0] Revert shared columns validation breaking change #29867
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Port of #29866
Fixes #29859
Description
The validation of provider CLR type for shared columns became stricter in 7.0 and it affected cases where the model wasn't actually invalid.
Customer impact
Affected models throw an exception during validation. There is no workaround.
How found
Customer reported on 7.0
Regression
Yes.
Testing
Added tests for the affected scenario.
Risk
Low; the fix is to throw in fewer cases, and a quirk was added to revert back to older behavior.