Sites: Move react elements to headers instead of labels

[allilevine]

Related to #94762

Proposed Changes

• Move the column headers, which are React elements, to header instead of label, to fix tooltip issues and type errors in DataViews.

Before	After

Why are these changes being made?

• Align with core and fix the tooltips.

Testing Instructions

• Go to /sites
• Verify that the column headers haven't changed from production.
• Verify that if you click the gear icon and hover over the headers in the Properties list, the tooltip for the hide icon doesn't say [object Object].

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

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[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~24 bytes added 📈 [gzipped])

name                parsed_size           gzip_size
staging-site             +104 B  (+0.0%)      +24 B  (+0.0%)
sites-dashboard          +104 B  (+0.0%)      +24 B  (+0.0%)
site-performance         +104 B  (+0.0%)      +24 B  (+0.0%)
site-monitoring          +104 B  (+0.0%)      +24 B  (+0.0%)
site-logs                +104 B  (+0.0%)      +24 B  (+0.0%)
hosting-features         +104 B  (+0.0%)      +24 B  (+0.0%)
hosting                  +104 B  (+0.0%)      +24 B  (+0.0%)
github-deployments       +104 B  (+0.0%)      +24 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.