[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 #3123 (comment)

[atamazov]

[Attribution] @junliume @JehandadKhan

• quality
• urgency_normal
• testing
• Proposed assignees: @averinevg (as discussed)

[assistant-librarian]

This issue has been migrated to: ROCm/rocm-libraries#872

[ammallya]

Imported to ROCm/rocm-libraries