Remove ArgumentsLexer

This is no longer being used.

Bug: b/389804379
Test: /usr/bin/bazel test '//...'

base/cvd/cuttlefish/host/commands/cvd/BUILD.bazel

@@ -108,7 +108,6 @@ cc_library(
         "cli/parser/load_configs_parser.cpp",
         "cli/parser/selector_parser.cpp",
         "cli/request_context.cpp",
-        "cli/selector/arguments_lexer.cpp",
         "cli/selector/arguments_separator.cpp",
         "cli/selector/creation_analyzer.cpp",
         "cli/selector/device_selector_utils.cpp",
@@ -203,7 +202,6 @@ cc_library(
         "cli/parser/load_configs_parser.h",
         "cli/parser/selector_parser.h",
         "cli/request_context.h",
-        "cli/selector/arguments_lexer.h",
         "cli/selector/arguments_separator.h",
         "cli/selector/creation_analyzer.h",
         "cli/selector/device_selector_utils.h",
@@ -311,9 +309,6 @@ cc_test(
         "unittests/parser/metrics_configs_test.cc",
         "unittests/parser/test_common.cc",
         "unittests/parser/test_common.h",
-        "unittests/selector/client_lexer_helper.cpp",
-        "unittests/selector/client_lexer_helper.h",
-        "unittests/selector/client_lexer_test.cpp",
         "unittests/selector/group_record_test.cpp",
         "unittests/selector/host_tool_target_test.cpp",
         "unittests/selector/instance_database_helper.cpp",