Use macro NUM_MERGE_MATCH_KINDS instead of '3' in MERGE code.

Dean Rasheed <dean.a.rasheed@gmail.com>

Commit: 2e068db56e31dfb510fe7416e52b7affe26f278f
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Date: 2024-04-19T08:40:20Z
Releases: 17.0
Use macro NUM_MERGE_MATCH_KINDS instead of '3' in MERGE code.

Code quality improvement for 0294df2f1f84.

Aleksander Alekseev, reviewed by Richard Guo.

Discussion: https://postgr.es/m/CAJ7c6TMsiaV5urU_Pq6zJ2tXPDwk69-NKVh4AMN5XrRiM7N%2BGA%40mail.gmail.com

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