fix: Censor cfg_attr for attribute macros #19125
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This is not documented (and I discovered that from experimenting and looking at the compiler's source code), but cfg_attrs *on the same level* as the attribute macro should be processed before it is expanded. cfg_attrs *below* should not (and this is contrary to what happens with derive macros, where both should be processed).
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This is not documented (and I discovered that from experimenting and looking at the compiler's source code), but cfg_attrs on the same level as the attribute macro should be processed before it is expanded. cfg_attrs below should not (and this is contrary to what happens with derive macros, where both should be processed).
Fixes #19121.