[Collapsible] Add transition properties

[kyledurand]

WHY are these changes introduced?

This will be a major part of adding animation to the navigation component: #2796

☝️ This will be ready for review shortly after this merges

Screencast

WHAT is this pull request doing?

This adds a transition prop to collapsible which takes duration and timingFunction to allow consumers to tailor the transition to their needs.

How to 🎩

🖥 Local development instructions
🗒 General tophatting guidelines
📄 Changelog guidelines

Copy-paste this code in playground/Playground.tsx:

import React from 'react';
import {Page} from '../src';

export function Playground() {
  return (
    <Page title="Playground">
      {/* Add the code you want to test in here */}
    </Page>
  );
}

🎩 checklist

• Tested on mobile
• Tested on multiple browsers
• Tested for accessibility
• Updated the component's README.md with documentation changes
• Tophatted documentation changes in the style guide
• For visual design changes, pinged one of @ HYPD, @ mirualves, @ sarahill, or @ ry5n to update the Polaris UI kit

[github-actions]

🟡 This pull request modifies 4 files and might impact 5 other files. This is an average splash zone for a change, remember to tophat areas that could be affected.

Details:

All files potentially affected (total: 5)

• /src/components/Filters/Filters.tsx
• /src/components/Navigation/components/Item/components/Secondary/Secondary.tsx
• /src/components/Navigation/components/Item/Item.tsx
• /src/components/Navigation/components/Section/Section.tsx
• /src/components/Navigation/Navigation.tsx

📄 UNRELEASED.md (total: 0)

Files potentially affected (total: 0)

🧩 src/components/Collapsible/Collapsible.tsx (total: 5)

Files potentially affected (total: 5)

• /src/components/Filters/Filters.tsx
• /src/components/Navigation/components/Item/components/Secondary/Secondary.tsx
• /src/components/Navigation/components/Item/Item.tsx
• /src/components/Navigation/components/Section/Section.tsx
• /src/components/Navigation/Navigation.tsx

📄 src/components/Collapsible/README.md (total: 0)

Files potentially affected (total: 0)

🧩 src/components/Collapsible/tests/Collapsible.test.tsx (total: 0)

Files potentially affected (total: 0)