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Re-add tracking of wait event SLRUFlushSync

SLRUFlushSync has been accidently removed duringdee663f, that has movedthe flush of the SLRU files to the checkpointer, so add it back. Theissue has been noticed by Thomas when checking for orphaned waitevents.Author: Thomas MunroReviewed-by: Bharath RupireddyDiscussion:https://postgr.es/m/CA+hUKGK6tqm59KuF1z+h5Y8fsWcu5v8+84kduSHwRzwjB2aa_A@mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -1603,7 +1603,9 @@ SlruSyncFileTag(SlruCtl ctl, const FileTag ftag, char path)`
`1603`	`1603`	`if (fd<0)`
`1604`	`1604`	`return-1;`
`1605`	`1605`
	`1606`	`+pgstat_report_wait_start(WAIT_EVENT_SLRU_FLUSH_SYNC);`
`1606`	`1607`	`result=pg_fsync(fd);`
	`1608`	`+pgstat_report_wait_end();`
`1607`	`1609`	`save_errno=errno;`
`1608`	`1610`
`1609`	`1611`	`CloseTransientFile(fd);`

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