fix(core): add minor changes to address form layout

[bc-alexsaiannyi]

What/Why?

The PR adds changes to address form layout like:

• gap between form elements reduced to gap-y-3
• removing top margin on heading;

Testing

locally

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
catalyst-latest	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 15, 2024 8:07am

6 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
catalyst	⬜️ Ignored (Inspect)			Jul 15, 2024 8:07am
catalyst-1millionproducts-store	⬜️ Ignored (Inspect)	Visit Preview		Jul 15, 2024 8:07am
catalyst-au	⬜️ Ignored (Inspect)	Visit Preview		Jul 15, 2024 8:07am
catalyst-test-store	⬜️ Ignored (Inspect)	Visit Preview		Jul 15, 2024 8:07am
catalyst-uk	⬜️ Ignored (Inspect)	Visit Preview		Jul 15, 2024 8:07am
catalyst-unstable	⬜️ Ignored (Inspect)	Visit Preview		Jul 15, 2024 8:07am

[changeset-bot]

🦋 Changeset detected

Latest commit: af76b31

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

This PR includes changesets to release 1 package

Name	Type
@bigcommerce/catalyst-core	Patch

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[github-actions]

⚡️🏠 Lighthouse report

Lighthouse ran against https://catalyst-latest-7jd6z6o90-bigcommerce-platform.vercel.app

🖥️ Desktop

We ran Lighthouse against the changes on a desktop and produced this report. Here's the summary:

Category	Score
🟢 Performance	100
🟢 Accessibility	100
🟢 Best practices	96
🟠 SEO	82

📱 Mobile

We ran Lighthouse against the changes on a mobile and produced this report. Here's the summary:

Category	Score
🟢 Performance	96
🟢 Accessibility	100
🟢 Best practices	96
🟠 SEO	85