Branch for testinf Phoenix-6984, phoenix-6983 and phoenix 6959 together on 5.1#1631

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stoty wants to merge 3 commits intoapache:5.1from

stoty:PHOENIX-6984-5.1-PHOENIX-6983-5.1-PHOENIX-6959

Commits on Jun 19, 2023

PHOENIX-6984 Fix fallback to skip-join-merge for hinted global indexes
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Commits on Jun 20, 2023

PHOENIX-6983 Add hint to disable server merges for uncovered index queries
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PHOENIX-6959 Server merges are not used for hinted uncovered indexes for wildcard selects on 5.1
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