fix: special case for gp_toolkit when gprestore close cloudberry #681

[yihong0618]

fix apache/cloudberry#681

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There are two commits for this PR:

• cherry-pick from gpdb/gpbackup for the case [Bug] gprestore report : -ERROR: schema "gp_toolkit" does not exist (SQLSTATE 3F000) cloudberry#681
• drop special case for gp7 since cloudberry always > 7

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✅ yihong0618
❌ AJR-VMware
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[tuhaihe]

Hi @yihong0618 thanks for your contribution!