docs: Update iOS docs to reflect removal of legacy event methods

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Updates documentation to reflect that onHeliumPaywallEvent(event:) and getCustomVariableValues() have been removed from the iOS Swift SDK (not just deprecated). Changes the third-party analytics iOS example to use the current onPaywallEvent(_:) method, and updates the migration guide to clearly indicate these methods are no longer available.

Trigger Events

• cloudcaptainai/helium-swift PR #161: Hel 4201 remove legacy event method

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Note

Updates iOS documentation to reflect removed legacy APIs and current usage.

• Migration guide: marks onHeliumPaywallEvent(event:) as removed with a warning and provides the onPaywallEvent(_:) replacement example; clarifies getCustomVariableValues removal and wording for custom paywall traits
• Guides: third-party analytics iOS snippet now uses onPaywallEvent(_:) and updated event types; minor copy tweaks around default StoreKit delegate and initialization

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