Inherit CODE_SIGN_STYLE in Keystone—makes it Manual (#24377)

This addresses a provisioning settings that would have resulting in
targets using the framework failing to build for distribution.

> Keystone has conflicting provisioning settings.
> Keystone is automatically signed, but code signing identity Apple Development: Created via API (886NX39KP6) has been manually specified.
> Set the code signing identity value to "Apple Development" in the build settings editor, or switch to manual signing in the Signing & Capabilities editor.

Author: mokagio

WordPress/WordPress.xcodeproj/project.pbxproj

@@ -6625,7 +6625,6 @@
 				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
-				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
@@ -6691,7 +6690,6 @@
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CODE_SIGN_IDENTITY = "Apple Distribution: Automattic, Inc. (PZYM8XX95Q)";
-				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
@@ -6753,7 +6751,6 @@
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CODE_SIGN_IDENTITY = "iPhone Distribution: Automattic, Inc.";
-				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";