feat(accordion-group): add default styles for the ionic theme

[brandyscarney]

Issue number: internal

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What is the current behavior?

The Accordion Group uses the Material Design styles for the Ionic theme.

What is the new behavior?

Adds the following:

• An ionic theme file with styles for the Accordion Group
• An e2e test for the expand property with screenshots of the default (compact) expand and "inset"
• An e2e test for states with screenshots of a disabled Accordion Group

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Other information

The styles for the Accordion are on #29933.

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Name	Status	Preview	Comments	Updated (UTC)
ionic-framework	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 16, 2024 3:27pm