Fix: add MPI_Barrier in unittest of CifParser when necessary to avoid unexpected behavoir #5167
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Background
There may be cases that the processors are not barriered and cause the failure of write and read cif files in unittest, this bug blocks the PR#5148, so I want to fix this immediately.
Linked Issue
Fix #5168
Unit Tests and/or Case Tests for my changes
What's changed?
Any changes of core modules? (ignore if not applicable)