feat: add hide column header menu item to explist

[ashtonG]

Description

This adds a header menu item to the experiment list table that hides the column from view. If the column is pinned, the column is unpinned when hidden.

Test Plan

• when visiting the experiment list table, click on a column header. The "hide column" menu item should appear in the header menu.
• after clicking on the "hide column" menu item, the column should not show up in the table
• after clicking on the "hide column" menu item when the column is pinned, the column should not show up in the table, and the number of pinned columns should decrease

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

WEB-1781

[netlify]

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[EmilyBonar]

LGTM!