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

This reverts commit 515e3d84a0 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

src/backend/postmaster/walwriter.c

@@ -248,13 +248,6 @@ WalWriterMain(void)
 		/* Process any signals received recently */
 		HandleWalWriterInterrupts();
 
-		/*
-		 * Notify the archiver of any WAL segments that are ready.  We do this
-		 * here to handle a race condition where WAL is flushed to disk prior
-		 * to registering the segment boundary.
-		 */
-		NotifySegmentsReadyForArchive(GetFlushRecPtr());
-
 		/*
 		 * Do what we're here for; then, if XLogBackgroundFlush() found useful
 		 * work to do, reset hibernation counter.