Added prop for VButton component to make button labels uppercase.
It uses text-transform css property which is better for screen readers.
Change-Id: I2a771af954a3bb9846a58dac9c2a1769e13f6e5c
Move ui tests to testsuite/ and introduce a new go.mod.
This prevents cyclic references when building edge binaries for testing.
Change-Id: I613fdc21ef9eaffba2052f6ad973bfa18c7c86bd