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Fix MERGE tuple count with DO NOTHING

Reporting tuples for which nothing is done is useless and goes againstthe documented behavior, so don't do it.Backpatch to 15.Reported by: Luca FerrariDiscussion:https://postgr.es/m/CAKoxK+42MmACUh6s8XzASQKizbzrtOGA6G1UjzCP75NcXHsiNw@mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -2799,7 +2799,7 @@ ExecMergeMatched(ModifyTableContext context, ResultRelInfo resultRelInfo,`
`2799`	`2799`	`{`
`2800`	`2800`	`caseTM_Ok:`
`2801`	`2801`	`/* all good; perform final actions */`
`2802`		`-if (canSetTag)`
	`2802`	`+if (canSetTag&&commandType!=CMD_NOTHING)`
`2803`	`2803`	`(estate->es_processed)++;`
`2804`	`2804`
`2805`	`2805`	`break;`

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