Change workerType used in stepstoreproduce training task to compute-small

[jpangas]

Issue:
Closes #3906

Comments:
This PR changes the workerType used in the pipeline task to train the stepstoreproduce model. The switch is from compute-small from compute-smaller.

[marco-c]

@jpangas can you trigger a training of the model here so we verify it actually fixes the problem? To test, you would also have to temporarily change

bugbug/.taskcluster.yml

Line 221 in 3f5b58b

workerType: compute-large

to compute-small.

[jpangas]

It runs succesfully. https://community-tc.services.mozilla.com/tasks/Zj2qsbZTQPesEYAyTx3OZQ

[marco-c]

Perfect! Let's revert the temporary change so we can merge the change.

[marco-c]

Thanks!