[17.0] Report errors for structs with missing field initializers and implicit parameterless constructor #59055
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Port fixes to 17.0 for two cases where invalid code is generated for struct constructors with missing field initializers. In both cases, compile errors are now reported instead.
Commits are ports of fixes for #58328 (commits 1 and 2) and #57870 (commit 3):
Breaking change documentation: see #59245