### What problem does this PR solve?
Fix: Create dataset performance unmatched between HTTP api and web ui
#10925
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
Move some test files to test/testcases
### Type of change
- [x] Refactoring
Signed-off-by: Jin Hai <haijin.chn@gmail.com>