feat(css): Add gl-xs-align-items-baseline utility class

Jiaan Louwrequested to merge
jl-gl-xs-align-items-baseline into master

What does this MR do?

Adds the gl-xs-align-items-baseline responsive utility class.

Required for responsiveness in gitlab!42711 (comment 416868461).

Does this MR meet the acceptance criteria?

Conformity

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