Re-enabling narrowing errors

[ellnor01]

Fixes narrowing conversion build errors in test_common

Removing disable of narrowing errors in main CMakeLists.txt and moving it down to specific test_conformance suite's CMakeLists.txt where there are many more build errors revealed from this fix.

Fixes a few simple issues under test_conformance in the process.

Contributes #787

Signed-off-by: Ellen Norris-Thompson [email protected]

[ellnor01]

Any comments on here?

[kpet]

@ahesham-arm This is failing the CI. It may require a rebase and/or fixes.

[ahesham-arm]

@kpet Rebased and all CI checks are now passing.

[bashbaug]

Merging as discussed in the October 8th teleconference.