Add Login for Admin feature.

[brandonpage]

I want feedback as early as possible, but I will leave it in draft until there is adequate test coverage.

The trickiest part is probably handling cancelling the new option:

login_for_admin_cancel.mov

[github-actions]

	1 Warning
⚠️	Static Analysis found an issue with one or more files you modified. Please fix the issue(s).

Clang Static Analysis Issues

File	Type	Category	Description	Line	Col
SFOAuthCoordinator	Nullability	Memory error	nil assigned to a pointer which is expected to have non-null value	120	19
SFOAuthCoordinator	Nullability	Memory error	nil assigned to a pointer which is expected to have non-null value	244	15
SFUserAccountManager	Nullability	Memory error	Null passed to a callee that requires a non-null 2nd parameter	1579	15
SFUserAccountManager	Nullability	Memory error	Null passed to a callee that requires a non-null 2nd parameter	1594	15
SFUserAccountManager	Nullability	Memory error	nil passed to a callee that requires a non-null 2nd parameter	2229	13

Generated by 🚫 Danger

[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
SalesforceSDKCore iOS ^18 Test Results	626 ran	621 ✅		5 ❌

Test	Result
SalesforceSDKCore iOS ^18 Test Results
testMissingMyDomain()	❌ failure
SFSDKAuthConfigUtilTests.testBrowserBasedLoginEnabled	❌ failure
SFUserAccountManagerTests.testAuthHandler	❌ failure
SalesforceRestAPITests.testCreateQuerySearchDelete	❌ failure
SalesforceRestAPITests.testUploadOwnedFilesDelete	❌ failure

• View SalesforceSDKCore iOS ^18 Test Results

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.24%. Comparing base (4d0d81f) to head (44e4d18).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
...forceSDKCore/Classes/Login/SFLoginViewController.m	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4022      +/-   ##
==========================================
- Coverage   70.42%   67.24%   -3.19%     
==========================================
  Files         246      253       +7     
  Lines       22326    22346      +20     
==========================================
- Hits        15724    15026     -698     
- Misses       6602     7320     +718     

Components	Coverage Δ
Analytics	70.78% <ø> (ø)
Common	69.75% <ø> (-1.16%)	⬇️
Core	60.16% <85.71%> (-4.94%)	⬇️
SmartStore	74.59% <ø> (+1.39%)	⬆️
MobileSync	87.41% <ø> (-1.78%)	⬇️

Files with missing lines	Coverage Δ
...lesforceSDKCore/Classes/OAuth/SFOAuthCoordinator.m	51.65% <100.00%> (-8.80%)	⬇️
...SalesforceSDKCore/Classes/OAuth/SFSDKAuthSession.m	91.42% <100.00%> (ø)
...SDKCore/Classes/UserAccount/SFUserAccountManager.m	54.36% <100.00%> (-6.21%)	⬇️
...forceSDKCore/Classes/Login/SFLoginViewController.m	70.44% <57.14%> (-4.14%)	⬇️

... and 112 files with indirect coverage changes

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
SalesforceSDKCore iOS ^26 Test Results	626 ran	623 ✅		3 ❌

Test	Result
SalesforceSDKCore iOS ^26 Test Results
SFSDKAuthConfigUtilTests.testBrowserBasedLoginEnabled	❌ failure
SalesforceRestAPITests.testCreateQuerySearchDelete	❌ failure
SalesforceRestAPITests.testUpdateWithIfUnmodifiedSince	❌ failure

• View SalesforceSDKCore iOS ^26 Test Results

[github-actions]

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

Test	Result
No test annotations available

• View AuthFlowTester UI Test Results all

[bbirman]

nit: could this be let effectiveUseWebServerFlow = loginForAdmin || useWebServerFlow?