Remove redundant biometric auto-present from SFLoginViewController.

[sfdctaka]

Summary

• Removes redundant biometric auto-presentation code from SFLoginViewController.viewDidLoad (lines 95-97)
• BiometricAuthenticationManagerInternal.lock() now serves as the single source of truth for auto-presenting biometric unlock
• The removed code did not respect the automaticPresentation flag introduced in PR Add option to automatically present biometric opt-in and lock  #4041

Context

PR #4041 added automaticPresentation to lock() which auto-presents biometric on all connected scenes. SFLoginViewController had its own independent auto-present logic that predated this and didn't check automaticPresentation. With automaticPresentation defaulting to true, both paths produced the same behavior — consolidating into lock() ensures the flag is always respected.

Test plan

• All 15 BiometricAuthenticationManagerTests pass
• Manual: webview login app with biometric policy + user opted in → biometric prompt still auto-presents on lock
• Manual: set automaticPresentation = false → biometric prompt does NOT auto-present (user must tap button)
• Manual: biometric button on login screen still works when tapped manually

[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
SalesforceSDKCore iOS ^18 Test Results	639 ran	633 ✅		6 ❌

Test	Result
SalesforceSDKCore iOS ^18 Test Results
testMalformedCallbackURL()	❌ failure
SFSDKAuthConfigUtilTests.testBrowserBasedLoginEnabled	❌ failure
SFUserAccountManagerTests.testUserAccountEncoding	❌ failure
SalesforceRestAPITests.testCreateQuerySearchDelete	❌ failure
SalesforceRestAPITests.testCreateUpdateQuerySearchDelete	❌ failure
SalesforceRestAPITests.testUpdateWithIfUnmodifiedSince	❌ failure

• View SalesforceSDKCore iOS ^18 Test Results

[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
SalesforceSDKCore iOS ^26 Test Results	639 ran	634 ✅		5 ❌

Test	Result
SalesforceSDKCore iOS ^26 Test Results
testSpecialCharactersInLoginHint()	❌ failure
SFOAuthCoordinatorTests.testMigrateRefreshTokenSetup	❌ failure
SFSDKAuthConfigUtilTests.testBrowserBasedLoginEnabled	❌ failure
SalesforceRestAPITests.testBlockUpdate	❌ failure
SalesforceRestAPITests.testCreateQuerySearchDelete	❌ failure

• View SalesforceSDKCore iOS ^26 Test Results

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.24%. Comparing base (d73eb2a) to head (6c5ade7).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4044      +/-   ##
==========================================
+ Coverage   68.18%   68.24%   +0.05%     
==========================================
  Files         245      245              
  Lines       21467    21465       -2     
==========================================
+ Hits        14638    14649      +11     
+ Misses       6829     6816      -13     

Components	Coverage Δ
Analytics	70.78% <ø> (ø)
Common	70.79% <ø> (ø)
Core	61.72% <ø> (+0.08%)	⬆️
SmartStore	73.44% <ø> (ø)
MobileSync	88.79% <ø> (ø)

Files with missing lines	Coverage Δ
...forceSDKCore/Classes/Login/SFLoginViewController.m	71.02% <ø> (+0.97%)	⬆️

... and 2 files with indirect coverage changes

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[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

• View AuthFlowTester UI Test Results all