[release-17.0] fix: remove keyspace when merging subqueries (#16019)#16025

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vitess-bot[bot] wants to merge 2 commits intorelease-17.0from

backport-16019-to-release-17.0

Commits on Jun 4, 2024

bugfix: When the planner is able to merge subqueries, it's important to remember to remove the keyspace from the query before adding the subquery to the outer query.
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test: add test asserting I_S queries are correct
systay
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