Fix use-after-free in GetExtStatisticsName#1745
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ReleaseSysCache(htup) was called before NameStr(staForm->stxname) was read, returning a pointer into the already-released tuple buffer. Copy the name with pstrdup() first, then release the cache entry.
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ReleaseSysCache(htup) was called before NameStr(staForm->stxname) was read, returning a pointer into the already-released tuple buffer. Copy the name with pstrdup() first, then release the cache entry.
Fixes #ISSUE_Number
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make installcheckmake -C src/test installcheck-cbdb-parallelImpact
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