Height of dropdowns and inputs should be the same by default

Problem

We patched the heights of logs page to gl-h-32 because by default:

• Our inputs have a height of exactly 32px (2rem) which is produced by the property height: auto;.
• Our buttons (btn) are rendered with a height of 34px (in Chrome) it appears to inherit from the browser style sheets.
• Out dropdowns have a default height of 35px which is inherited from boostrap's default styles.

Goal

Remove gl-h-32 once the buttons get harmonized to a single height and style.

Original Discussion

The following discussion from gitlab!23837 (merged) should be addressed:

• @mrincon started a discussion: (+2 comments)

  /cc @nadia_sotnikova