fix(): populate _get_params_method to monitor and udd objects

[piotrkluba]

Note

Ensures result models created from case files can access simulation params.

• Set ._get_params_method on created MonitorCSVModel and UserDefinedDynamicsCSVModel instances in case_results.py
• Add mock case files payload tests/data/mock_webapi/case_files_mock_response.json and wire route in tests/mock_server.py
• Add test test_udd_monitors_get_params_method in tests/test_results.py asserting results.user_defined_dynamics[...] and results.monitors[...] expose _get_params_method()
• Minor formatting fix to tests/data/mock_webapi/case_params_resp.json

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[benflexcompute]

Can you rebase and send this to 25.7 or 25.6 instead? Then there will be auto hotfix PRs by CI.