fix: Make setSessionId synchronous to prevent race with MPRoktLayout

[nickolas-dimitrakas]

Summary

• Fixes a race condition where setSessionId was delivered asynchronously (two dispatch_async(main) hops via forwardSDKCall) while MPRoktLayout reads the session synchronously from UserDefaults, causing the session ID to be missing on the execute request.
• Uses the same direct kit access pattern that getSessionId already uses, matching Android's synchronous behavior.
• Falls back to forwardSDKCall when kits haven't initialized yet.

Test plan

• New test: testSetSessionIdIsReceivedByKitSynchronously -- confirms the kit receives the session ID synchronously
• New test: testSetSessionIdSynchronousDoesNotUseForwardSDKCall -- confirms forwardSDKCall is bypassed when kit is active
• New test: testSetSessionIdFallsBackToForwardSDKCallWhenKitNotAvailable -- confirms fallback queuing behavior
• Full test suite passes (33/33 MPRoktTests, full suite green)
• trunk check clean
• iOS build succeeds

Made with Cursor

[cursor]

PR Summary

Medium Risk
Changes runtime behavior of MPRokt setSessionId: to bypass the queued forwardSDKCall path when the Rokt kit is active, which could affect call ordering/timing and relies on dynamic selector invocation; fallback queuing remains for uninitialized kits.

Overview
Fixes a race where MPRokt setSessionId: could be delivered too late by attempting to forward the session ID directly and synchronously to the active Rokt kit instance (via activeKitsRegistry), instead of always queueing through forwardSDKCall.

If the Rokt kit isn’t available yet, setSessionId: now falls back to the existing deferred forwardSDKCall path. Unit tests are updated to assert (1) direct synchronous delivery, (2) no forwardSDKCall usage when the kit is present, and (3) correct fallback behavior when it isn’t.

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[github-actions]

📦 SDK Size Impact Report

Measures how much the SDK adds to an app's size (with-SDK minus without-SDK).

Metric	Target Branch	This PR	Change
App Bundle Impact	1.82 MB	1.82 MB	+N/A
Executable Impact	896 bytes	896 bytes	+N/A
XCFramework Size	9.51 MB	9.50 MB	-4 KB

➡️ SDK size impact change is minimal.

Raw measurements

Target branch (workstation/8.x-Maintenance):

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1948,"with_sdk_executable_size_bytes":76360,"sdk_impact_kb":1864,"sdk_executable_impact_bytes":896,"xcframework_size_kb":9736}

This PR:

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1948,"with_sdk_executable_size_bytes":76360,"sdk_impact_kb":1864,"sdk_executable_impact_bytes":896,"xcframework_size_kb":9732}