Fix SemantiDB production of method signature with shadowed parameters #23161
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…scala#23161) [Cherry-picked 3080a70][modified]
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Fixes #23160
The problem was caused by the way we populated the paramRefSymtab in TypeOps.scala.
In #23160 when looking at val x, we will enterParamRef of its owner which is foo. However foo also has a param with name x so it will enter the symbol of the val x in the paramRefSymTab which is incorrect.
We therefore must make sure the symbol is a param to be entered if it's owner was a method.
New test cases were added to confirm the fix.