bug(material/select): incorrect or missing SELECT_ITEM_HEIGHT_EM migration for v12

[DenysVuika]

When upgrading from Angular Components 11 to 12, the SELECT_ITEM_HEIGHT_EM constant is not exported from the @angular/material/select anymore and the projects that rely on this constant won't compile.

Expected Behavior

What behavior were you expecting to see?

The upgrade tools fix the namespace to be @angular/material/select/select, or export the constant properly from the @angular/material/select

Actual Behavior

Compilation issues as constant is no longer exported

[jelbourn]

This was an intentional removal of a deprecated symbol in v12: #21827.

It does look like there was a bug with our changelog script, though, that didn't include this in the changelog.

[HaidarZ]

Why it has been removed despite it's still used inside the select component code.

[angelaki]

Any news on this?

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