pgsql: Revert "Avoid creating archive status ".ready" files too early"

Revert "Avoid creating archive status ".ready" files too early"

This reverts commit 515e3d84a0b5 and equivalent commits in back
branches.  This solution to the problem has a number of problems, so
we'll try again with a different approach.

Per note from Andres Freund

Discussion: https://postgr.es/m/20210831042949.52eqp5xwbxgrfank@alap3.anarazel.de

Branch
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REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/e456167a8af428dffb1621ae5c9e29147cb005f2

Modified Files
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src/backend/access/transam/xlog.c  | 216 ++-----------------------------------
src/backend/postmaster/walwriter.c |   7 --
src/include/access/xlog.h          |   1 -
src/include/access/xlogdefs.h      |   1 -
4 files changed, 10 insertions(+), 215 deletions(-)