Summary: This applies both to the first render of a table, and double clicking on drag handles.

Test Plan: Try any script with few columns, like `px/agent_status`. The columns should get a sensible layout on first render, not snap around on first resize, and double clicking a drag handle should reset the ratio between the columns on either side without affecting any other columns.

Reviewers: #engineering, nserrino, michelle, vihang, philkuz

Reviewed By: #engineering, philkuz

JIRA Issues: PC-682

Differential Revision: https://phab.corp.pixielabs.ai/D6804

GitOrigin-RevId: 07bee1ea07b5f491cf01b3b79ddec45a89587756