Update SalesforceSDKCoreTestApp to use scene lifecycle

[bbirman]

Modernize to avoid this warning in the logs:
"UIScene lifecycle will soon be required. Failure to adopt will result in an assert in the future."

[bbirman]

Updated to use the same structure as the common test app. If this sounds good I'll do the same thing to the test apps for analytics, mobile sync and smart store

[github-actions]

	Tests	Passed	Skipped	Failed ❌️
AuthFlowTester UI Test Results all	1 ran			1 ❌

Test	Result
AuthFlowTester UI Test Results all
AuthFlowTesterUITests.xctest
LegacyLoginTests.testCAOpaque_DefaultScopes_WebServerFlow()	❌ failure

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.66%. Comparing base (4d7e758) to head (e450fff).
⚠️ Report is 4 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4076      +/-   ##
==========================================
- Coverage   70.99%   66.66%   -4.34%     
==========================================
  Files         246      246              
  Lines       21501    21501              
==========================================
- Hits        15265    14334     -931     
- Misses       6236     7167     +931     

Components	Coverage Δ
Analytics	70.78% <ø> (ø)
Common	70.79% <ø> (-0.19%)	⬇️
Core	59.29% <ø> (-6.67%)	⬇️
SmartStore	73.44% <ø> (-0.16%)	⬇️
MobileSync	88.79% <ø> (-0.03%)	⬇️
see 40 files with indirect coverage changes

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[wmathurin]

👍

[github-actions]

	1 Warning
⚠️	Big PR, try to keep changes smaller if you can.

Generated by 🚫 Danger

[github-actions]

	Tests	Passed ✅	Skipped	Failed
SalesforceAnalytics iOS ^18 Test Results	19 ran	19 ✅

Test	Result
No test annotations available

[github-actions]

	Tests	Passed ✅	Skipped	Failed
SmartStore iOS ^18 Test Results	177 ran	177 ✅

Test	Result
No test annotations available

[github-actions]

	Tests	Passed ✅	Skipped	Failed
SalesforceAnalytics iOS ^26 Test Results	19 ran	19 ✅

Test	Result
No test annotations available

[github-actions]

	Tests	Passed ✅	Skipped	Failed
SmartStore iOS ^26 Test Results	177 ran	177 ✅

Test	Result
No test annotations available

[github-actions]

	Tests	Passed ✅	Skipped	Failed
SalesforceSDKCore iOS ^18 Test Results	652 ran	652 ✅

Test	Result
No test annotations available

[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
MobileSync iOS ^26 Test Results	234 ran	227 ✅		7 ❌

Test	Result
MobileSync iOS ^26 Test Results
BriefcaseSyncDownTests.testCleanGhostsOneObjectType()	❌ failure
BriefcaseSyncDownTests.testCleanGhostsTwoObjectTypes()	❌ failure
BriefcaseSyncDownTests.testIdsToSkip()	❌ failure
BriefcaseSyncDownTests.testStartFetchWithMaxTimestamp()	❌ failure
BriefcaseSyncDownTests.testStartFetchWithoutMaxTimestamp()	❌ failure
BriefcaseSyncDownTests.testSyncDownFetchingTwoObjectTypes()	❌ failure
BriefcaseSyncDownTests.testSyncDownFetchingTwoObjectTypesMultipleRetrieveCalls()	❌ failure

[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
MobileSync iOS ^18 Test Results	234 ran	233 ✅		1 ❌

Test	Result
MobileSync iOS ^18 Test Results
SyncManagerTests.testCleanResyncGhostsForMRUTarget	❌ failure

[github-actions]

	Tests	Passed ✅	Skipped	Failed
SalesforceSDKCore iOS ^26 Test Results	652 ran	652 ✅

Test	Result
No test annotations available

[bbirman]

Will update the other test apps in other PRs to avoid having a large PR