Rename web_hook_calls column to web_hook_calls_high

What does this MR do and why?

When we introduced stepped limits to web_hook_calls, we added two columns, web_hook_calls_min and web_hook_calls_mid. This left the existing column named web_hook_calls. We are now renaming it web_hook_calls_high for consistency.

Closes Rename plan_limits.web_hook_calls column to web... (#364750 - closed)

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.