fix: add gap inside SubNavHeader

[remidej]

What does it do?

Adds a gap between the SubNavHeader label and search icon

Why is it needed?

Because it looked like this:

The space-between was ignored because the element itself was shrunk by the parent flex, and there was no gap defined

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: c57788ec6c927aef78cd5a4524d81b33dcc4b638

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | --------------------- | ----- | | @strapi/design-system | Patch | | @strapi/icons | Patch | | @strapi/ui-primitives | Patch |

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Name	Status	Preview	Comments	Updated (UTC)
design-system	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 1, 2024 8:22am

[github-actions[bot]]

Size Change: +4 B (0%)

Total Size: 289 kB

Filename	Size	Change
packages/design-system/dist/index.js	95.1 kB	+2 B (0%)
packages/design-system/dist/index.mjs	94 kB	+2 B (0%)

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `packages/icons/dist/index.js` | 21.9 kB | | `packages/icons/dist/index.mjs` | 21.6 kB | | `packages/icons/dist/symbols-index.js` | 11.8 kB | | `packages/icons/dist/symbols-index.mjs` | 11.6 kB | | `packages/primitives/dist/index.js` | 16.8 kB | | `packages/primitives/dist/index.mjs` | 16.3 kB |

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