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gltestperf: Don't overflow int, use float as intended

Convert to consistently use float for time and per-sec measurements.

On fast hardware the `numelem * bmark->size[0]` can easily overflow 32-bit int.
3 jobs for baryluk-master-patch-36976 in 2 minutes and 47 seconds
latest
Status Job ID Name Coverage
  Container
passed #7987421
x86_build

00:00:32

 
  Build
passed #7987423
autotools

00:02:14

passed #7987422
cmake

00:01:44