Tests: Update Texture coordinate tests so they produce more useful hydra results
The hydra render engine can not render a colour connected directly to a material output. This was used a lot in the texture coordinate tests, and as such these tests produced blank results. This commit adds a emission shader between the colour and the output so hydra can produce more useful results. There is no change in the output for Cycles and EEVEE, so those reference images are not updated.
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