Test request UUID values validation

[Glutexo]

There are various UUID values in various requests. Each of them must be properly validated, resulting in 400 Bad Request if invalid.

• GET /hosts – insights_id in query (Test query hosts by invalid insights ID #266)
• POST /hosts – bios_uuid in body
• GET /hosts/{host_id_list} – host_id_list in path (Test query host by ID #268)
• PATCH /hosts/{host_id_list} – host_id_list in path (Test patch hosts by troublesome IDs #267)
• GET /hosts/{host_id_list}/system_profile – host_id_list in path

Although all of those cases are properly handled and validated, not all of these validation are tested. Add the missing tests to make sure that the validation works as intended and to prevent regressions.

[Glutexo]

Only #268 remains!