Heading: Hide border controls by default

[aaronrobertshaw]

Related:

• Tracking: Border Design Tools Consistency #43247

What?

Makes border support controls for the heading block optional, i.e. not displayed by default.

Why?

The general consensus through work on #43247 is that default display of border controls should match the display of margin and padding controls.

The heading block makes margin and padding optional controls so they have to be toggled on via the Dimension panel's ToolsPanel button. This PR makes the border controls consistent with that.

How?

Removes default controls config for border controls in the Heading block.json.

Testing Instructions

1. Edit a post and add a heading block
2. Ensure that the border controls are hidden by default
3. Toggle on the border controls and make sure they work as expected.

Screenshots or screencast

Before	After

[github-actions]

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Co-authored-by: aaronrobertshaw <[email protected]>
Co-authored-by: akasunil <[email protected]>
Co-authored-by: ramonjd <[email protected]>

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[github-actions]

Flaky tests detected in f40c8c3.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/11910359862
📝 Reported issues:

• [Flaky Test] Redirection after template creation #60678 in /test/e2e/specs/site-editor/site-editor-url-navigation.spec.js

[ramonjd]

🚢

Trunk	This PR