Fix gitignore for Primer forms move

[camertron]

What are you trying to accomplish?

We're running into a weird test failure in dotcom where it appears none of the .d.ts files are available in the primer/view-components package. I believe the problem is due to a recent PR that moved the Primer forms code, but left a few old references inside the gitignore file. The .d.ts files are effectively being git ignored, which appears to prevent them from being packaged up and submitted to NPM.

This PR fixes the ignore paths. I have confirmed the .d.ts files are now available in the published packages on NPM.

Integration

No changes necessary in production.

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

Accessibility

• No new axe scan violation - This change does not introduce any new axe scan violations.

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Latest commit: 5baf4a7

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