Everywhere: Rename {Deprecated => Byte}String

This commit un-deprecates DeprecatedString, and repurposes it as a byte
string.
As the null state has already been removed, there are no other
particularly hairy blockers in repurposing this type as a byte string
(what it _really_ is).

This commit is auto-generated:
  $ xs=$(ack -l \bDeprecatedString\b\|deprecated_string AK Userland \
    Meta Ports Ladybird Tests Kernel)
  $ perl -pie 's/\bDeprecatedString\b/ByteString/g;
    s/deprecated_string/byte_string/g' $xs
  $ clang-format --style=file -i \
    $(git diff --name-only | grep \.cpp\|\.h)
  $ gn format $(git ls-files '*.gn' '*.gni')

Tests/Kernel/TestKernelFilePermissions.cpp

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <AK/DeprecatedString.h>
+#include <AK/ByteString.h>
 #include <LibFileSystem/FileSystem.h>
 #include <LibTest/TestCase.h>
 #include <fcntl.h>
@@ -81,11 +81,11 @@ TEST_CASE(test_change_file_location)
     ftruncate(fd, 0);
     EXPECT(fchmod(fd, 06755) != -1);
 
-    auto suid_path_string = TRY_OR_FAIL(FileSystem::read_link(DeprecatedString::formatted("/proc/{}/fd/{}", getpid(), fd)));
+    auto suid_path_string = TRY_OR_FAIL(FileSystem::read_link(ByteString::formatted("/proc/{}/fd/{}", getpid(), fd)));
 
-    auto suid_path = suid_path_string.to_deprecated_string();
+    auto suid_path = suid_path_string.to_byte_string();
     EXPECT(suid_path.characters());
-    auto new_path = DeprecatedString::formatted("{}.renamed", suid_path);
+    auto new_path = ByteString::formatted("{}.renamed", suid_path);
 
     rename(suid_path.characters(), new_path.characters());
 

Tests/Kernel/TestKernelPledge.cpp

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <AK/DeprecatedString.h>
+#include <AK/ByteString.h>
 #include <LibTest/TestCase.h>
 #include <errno.h>
 #include <unistd.h>
@@ -18,7 +18,7 @@ TEST_CASE(test_nonexistent_pledge)
 
 TEST_CASE(test_pledge_argument_validation)
 {
-    auto const long_argument = DeprecatedString::repeated('a', 2048);
+    auto const long_argument = ByteString::repeated('a', 2048);
 
     auto res = pledge(long_argument.characters(), "stdio");
     EXPECT_EQ(res, -1);

Tests/Kernel/crash.cpp

@@ -6,7 +6,7 @@
  */
 
 #include <AK/Assertions.h>
-#include <AK/DeprecatedString.h>
+#include <AK/ByteString.h>
 #include <AK/Function.h>
 #if ARCH(X86_64)
 #    include <Kernel/Arch/x86_64/IO.h>

Tests/Kernel/fuzz-syscalls.cpp

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <AK/DeprecatedString.h>
+#include <AK/ByteString.h>
 #include <AK/Format.h>
 #include <AK/Random.h>
 #include <AK/StringBuilder.h>
@@ -101,7 +101,7 @@ static void do_weird_call(size_t attempt, int syscall_fn, size_t arg1, size_t ar
         builder.appendff("{:p}", fake_params[i]);
     }
     builder.append(']');
-    dbgln("{}", builder.to_deprecated_string());
+    dbgln("{}", builder.to_byte_string());
 
     // Actually do the syscall ('fake_params' is passed indirectly, if any of arg1, arg2, or arg3 point to it.
     int rc = syscall(Syscall::Function(syscall_fn), arg1, arg2, arg3);

Tests/Kernel/stress-truncate.cpp

@@ -18,7 +18,7 @@ int main(int argc, char** argv)
     for (auto i = 0; i < argc; ++i)
         arguments.append({ argv[i], strlen(argv[i]) });
 
-    DeprecatedString target;
+    ByteString target;
     int max_file_size = 1024 * 1024;
     int count = 1024;
 

Tests/Kernel/stress-writeread.cpp

@@ -65,7 +65,7 @@ int main(int argc, char** argv)
     for (auto i = 0; i < argc; ++i)
         arguments.append({ argv[i], strlen(argv[i]) });
 
-    DeprecatedString target;
+    ByteString target;
     int min_block_offset = 0;
     int block_length = 2048;
     int block_size = 512;