Insert more data to make tuplestore spill in regress/misc_jiras.sql.

[fanfuxiaoran]

This is a follow-up patch for ad8b266 and a039910 to make pipelines happy.

Previous commits are causing CI failure.
See: https://prod.ci.gpdb.pivotal.io/teams/main/pipelines/gpdb_master_without_asserts/jobs/icw_planner_icproxy_ubuntu18.04/builds/603

(cherry picked from commit 09056de6940bd95cf4382474a1d3c6bdb60500d9)

fix #ISSUE_Number

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