Migrate from `PrivateSentrySDKOnly` to `[SentryObjCSDK internal]`

[philprime]

sentry-cocoa 9.19.0 introduces a new structured hybrid SDK API via SentryObjCSDK.internal (ObjC). The old PrivateSentrySDKOnly class is deprecated and will be removed in the next major version.

Implementation PR: getsentry/sentry-cocoa#8097
Design doc: SENTRY-INTERNAL-API.md

Benefits

• No more internal header imports. Drop PrivateSentrySDKOnly.h, SentrySwizzle.h, and any private header search path. The new API is fully public.
• Structured, discoverable API. Methods are grouped by feature area (.replay, .profiling, .performance, etc.).
• SPM / xcframework compatible. Works with binary distribution — no exposed private headers.
• capture returns BOOL. No more performSelector: workaround on getReplayIntegration.

Import Change

Since React Native's iOS code is Objective-C (.m / .mm), migrate to the SentryObjC target:

// Before
#import <Sentry/PrivateSentrySDKOnly.h>
#import <Sentry/SentrySwizzle.h>

// After — single import, no private headers
#import <SentryObjC/SentryObjC.h>
// Access via [SentryObjCSDK internal].*

Affected Files (as of latest main)

• packages/core/ios/RNSentry.mm — largest call site (~30 usages)
• packages/core/ios/RNSentryStart.m — SDK init, name/version/package setup
• packages/core/ios/RNSentryReplay.mm — replay container classes
• packages/core/ios/RNSentryReplayBreadcrumbConverterHelper.m — replay breadcrumb config
• packages/core/ios/RNSentryRNSScreen.m — SentrySwizzle.h macro usage
• packages/core/ios/SentrySDKWrapper.m — options.debug, options.releaseName
• packages/core/ios/SentryScreenFramesWrapper.m — currentScreenFrames
• packages/core/ios/RNSentrySDK.m — optionsWithDictionary:didFailWithError:

Full migration table

See the detailed migration guide for complete before/after for every method.

Key changes:

• [PrivateSentrySDKOnly setSdkName:name andVersionString:version] → [[[SentryObjCSDK internal] sdk] setName:name version:version]
• [PrivateSentrySDKOnly captureReplay] (void) → [[[SentryObjCSDK internal] replay] capture] (returns BOOL)
• SentrySwizzleInstanceMethod macro → [[[SentryObjCSDK internal] swizzle] swizzleInstanceMethod:inClass:newImpFactory:mode:key:]
• [PrivateSentrySDKOnly envelopeWithData:] → [[[SentryObjCSDK internal] envelope] deserializeFrom:]
• [PrivateSentrySDKOnly optionsWithDictionary:didFailWithError:] → [[SentryObjCSDK internal] optionsFromDictionary:error:]

Checklist

• Replace all PrivateSentrySDKOnly call sites with [SentryObjCSDK internal].*
• Remove SentrySwizzle.h import and macro usage in RNSentryRNSScreen.m
• Change imports from #import <Sentry/PrivateSentrySDKOnly.h> to #import <SentryObjC/SentryObjC.h>
• Remove private header search paths from Podspec / build settings
• Remove performSelector: workaround for replay capture
• Bump minimum sentry-cocoa dependency to 9.19.0+
• Run full test suite

[linear-code]

RN-692