Supplement XML pagination and add relevant spector test cases

[v-jiaodi]

Here is the test case for XML pagination: https://github.com/microsoft/typespec/blob/main/packages/http-specs/specs/payload/pageable/main.tsp#L520-L655

Add test for xml pagination with next link

[qiaozha]

@v-jiaodi please leverage the SKILL to add the test see if there's any codegen issues?