[DNM]Enable the resgroup test cases

[jiaqizho]

fix #ISSUE_Number

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[jiaqizho]

will rebase this pr after https://github.com/cloudberrydb/cloudberrydb/pull/531 merged

[jiaqizho]

no sure why no exec the prepare_resgroup, let me check

[tuhaihe]

FYI: I also added this new icw-resgroup-test as one required check for the pull request merge.