pg_upgrade: Parallelize postfix operator check.

This commit makes use of the new task framework in pg_upgrade to
parallelize the check for user-defined postfix operators.  This
step will now process multiple databases concurrently when
pg_upgrade's --jobs option is provided a value greater than 1.

Reviewed-by: Daniel Gustafsson, Ilya Gladyshev
Discussion: https://postgr.es/m/20240516211638.GA1688936%40nathanxps13

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/c34eabfbbfd3d3799bc7bc61f22b1fe730c53fe8

Modified Files
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src/bin/pg_upgrade/check.c | 146 +++++++++++++++++++++++----------------------
1 file changed, 75 insertions(+), 71 deletions(-)

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