Remove some global variables from vacuum.c

Using global variables because we don't want to pass these values around
as parameters does not really seem like a great idea, so let's remove
these two global variables and adjust a few functions to accept these
values as parameters instead.

This is part of a wider patch which intends to allow the size of the
buffer access strategy that vacuum uses to be adjusted.

Author: Melanie Plageman
Reviewed-by: Bharath Rupireddy
Discussion: https://postgr.es/m/CAAKRu_b1q_07uquUtAvLqTM%3DW9nzee7QbtzHwA4XdUo7KX_Cnw%40mail.gmail.com

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