make test-go fails on ARM64 because of float comparisons

[danxmoran]

Steps to reproduce:

1. Check out influxdb on an ARM64 system
2. Run make test-go

Expected behavior:
Tests pass. Any tests that deal with float comparisons either check a delta of allowable values, or round to a precision low enough to pass on both x86_64 and ARM64.

Actual behavior:
A handful of tests fail, with diffs that show mismatches in float values. The diffs I spot-checked were all in the ~15th digit after the decimal point.

[danxmoran]

This has been fixed. Tests now run under ARM64 as part of PR validation to prevent bad comparisons from sneaking in again.