Split multiple interpolation tests using the sample decoration

Split multiple interpolation tests using the sample decoration

This commit separates the multiple interpolation tests in two groups,
one including the sample decoration in the set and another one excluding
it. The goal is to avoid requiring the sampleRateShading feature in all
tests, which is mandatory when using the sample decoration.

In addition, this commit makes sure the sampleRateShading feature is
required for those cases.

New tests:
dEQP-VK.draw.multiple_interpolation.*.no_sample_decoration.*

Affected tests:
dEQP-VK.draw.multiple_interpolation.*

Components: Vulkan
VK-GL-CTS issue: 3129

Change-Id: I8c190c70db9e7fef7505dc31bbf8b6626161f60e