refactor(ios): remove dead SentrySDKWrapper init surface (#6059)

* refactor(ios): remove dead SentrySDKWrapper init surface

`SentrySDKWrapper.createOptionsWithDictionary:isSessionReplayEnabled:error:`
(and `setupWithDictionary:`, `startWithOptions:`, `enableAutoSessionTracking`,
`enableWatchdogTerminationTracking`) became dead when v8 moved init to
`RNSentryStart` (#5582 / #4442). The dead methods had a parallel test suite
that kept passing, which is exactly how the bugs in #6012 and #6014 shipped:
new code was added to `SentrySDKWrapper` because the tests there made it look
like the live surface.

Delete the dead methods, migrate the still-relevant test coverage to
`RNSentryStart`-based tests, drop duplicate tests already pinned on
`RNSentryStart`. `SentrySDKWrapper.h` is not in the podspec's
`public_header_files`, so no downstream consumers are affected. The kept
methods (`configureScope:`, `crash`, `close`, `crashedLastRun`, `debug`,
`releaseName`) continue to be used from `RNSentry.mm`.

Closes #6015.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(test): drop duplicate testStartBeforeBreadcrumbs… method

The migration in the previous commit added a `testStart…KeepsBreadcrumbWhenDevServerUrlIsNotPassed…`
method that already existed in the `RNSentryStart Tests` block. Compile failed
in CI with "Duplicate declaration of method". The earlier
`@interface RNSentryStart Tests` already covers this scenario; the migrated
copy is redundant.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(test): use designated initializers for SentryException and SentryMessage

Warden flagged the migrated tests using `[SentryException alloc]` and
`[SentryMessage alloc]` without `init`. Both classes have `SENTRY_NO_INIT`
and require designated initializers (`initWithValue:type:` and
`initWithFormatted:`), so the alloc-only pattern is undefined behavior —
property assignments happened to work via zero-initialized memory but
the test could crash or behave inconsistently and mask real regressions.

The pattern was inherited from the original SentrySDKWrapper-based tests
this PR migrated; same fix applied across all 12 occurrences.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: antonis