Removes font resets in links if not needed

What does this MR do and why?

Due to an font override in the gitlab-ui links that were rendered in containers with small text needed to reset the font size to have the style of their container.

This change removes such overrides as they are not necessary in gitlab-ui v66.36.0

Part of #429351 (closed): Removes .gl-font-size-inherit and .gl-reset-font-size, while a second MR will address usages of .font-size-inherit.

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MR acceptance checklist

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Related to #2357 (closed)