[tests] Remove default datatype and fail when datatype is not set. Fix tests.

[atamazov]

Remove default datatype and fail when datatype is not set. Fix tests.

Originally posted by @atamazov in https://github.com/ROCm/MIOpen/pull/3123#discussion_r1697486280

[atamazov]

[Attribution] @junliume @JehandadKhan

• https://github.com/ROCm/MIOpen/labels/quality
• https://github.com/ROCm/MIOpen/labels/urgency_normal
• https://github.com/ROCm/MIOpen/labels/testing
• Proposed assignees: @averinevg (as discussed)

[assistant-librarian[bot]]

This issue has been migrated to: https://github.com/ROCm/rocm-libraries/issues/872

[ammallya]

Imported to ROCm/rocm-libraries