fix(css): ensure we correctly generate gl-flex-direction-column utils

What does this MR do?

It looks like the gl-*-flex..! variants of utilities were not being correctly generated. This MR re-orders the gl-*-flex-direction-column mixins to ensure we define gl-flex-direction-column before all the gl-*-flex-direction-column variants. Locally this appears to fix the outputted build.

This was noticed by @23bytes in gitlab#368329 (comment 1076709139)

You can verify this by comparing the output of src/scss/utilities.scss after creating a new build.

Before	After

Does this MR meet the acceptance criteria?

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