ref(android): Remove Nav3 breadcrumb TypeCheckHint

[0xadam-brown]

📜 Description

Removes our Nav3 TypeCheckHint for breadcrumbs, which was cargo-culted from Nav2. (The Nav2 use case is described here; it doesn't apply to Nav3 for the reasons given below.)

💡 Motivation and Context

Were we to keep the TypeCheckHint, developers would be able to access Nav3 breadcrumbs via the beforeBreadcrumb callback. But that's not needed because - unlike Nav2 - developers can scrub Nav3 data before it's recorded. Our public KDocs instruct them to do so for all Sentry Nav3 data, not just breadcrumbs.

Supporting a mechanism for after-the-fact access to just breadcrumb data (and not other Nav3 data) would be both asymmetrical and superfluous.

Note: I'm assuming there a policy that requires TypeCheckHints for breadcrumbs. That seems correct, as only some of our breadcrumb-producing integrations use TypeCheckHints and my clanker couldn't find any Sentry docs that indicate they're required.

addresses: JAVA-274

💚 How did you test it?

n/a

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

🔮 Next steps

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.59.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[0xadam-brown]

Rebased on an updated target; otherwise unchanged.