Do a tiny bit of header file maintenance

Álvaro Herrera <alvherre@kurilemu.de>

Commit: 3bf31dd24314ceea078f1ae9549c1a60c8a186d8
Author: Álvaro Herrera <alvherre@kurilemu.de>
Date: 2025-09-30T10:28:29Z
Do a tiny bit of header file maintenance

Stop including utils/relcache.h in access/genam.h, and stop including
htup_details.h in nodes/tidbitmap.h.  Both these files (genam.h and
tidbitmap.h) are widely used in other header files, so it's in our best
interest that they remain as lean as reasonable.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/202509291356.o5t6ny2hoa3q@alvherre.pgsql

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