### What problem does this PR solve?

Add license statement.

### Type of change

- [x] Refactoring

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

### What problem does this PR solve?

Fix errors detected by Ruff

### Type of change

- [x] Refactoring

### What problem does this PR solve?

1. Test not allowed fields of dataset

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
- [x] Other (please describe): Test cases

Signed-off-by: jinhai <haijin.chn@gmail.com>

### What problem does this PR solve?



### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: Jin Hai <haijin.chn@gmail.com>

### What problem does this PR solve?

Fix test cases

### Type of change

- [x] Other (please describe): Fix error cases

---------

Signed-off-by: jinhai <haijin.chn@gmail.com>

### What problem does this PR solve?

Test cases about dataset

### Type of change

- [x] Other (please describe): test cases

---------

Signed-off-by: jinhai <haijin.chn@gmail.com>

### What problem does this PR solve?

Feat: Scrolling knowledge base list and set the number of entries per
page to 30 #3695

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

1. Read KB list path parameter, page_number and page_size, which type
isn't int
2. Add cases on create / list / delete datasets.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
- [x] Test cases

Signed-off-by: jinhai <haijin.chn@gmail.com>

### What problem does this PR solve?

Add tests for frontend API

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

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Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>