Remove unused websocketProxyURL property #38887

Job	Run time
set_release_type	4s
check_code_changes	14s
lint	1m 48s
test_ios_rntester_dynamic_frameworks	0s
build_debugger_shell	0s
prebuild_apple_dependencies	0s
build_android	12m 33s
prebuild_react_native_core	-1s
test_ios_helloworld	0s
test_ios_rntester_ruby_3_2_0	0s
test_ios_rntester	0s
test_ios_helloworld_with_ruby_3_2_0	0s
test_e2e_ios_rntester	0s
test_e2e_ios_rntester_retry_1	-1s
test_e2e_ios_rntester_retry_2	-1s
test_js (20.19.4)	4m 22s
test_js (24)	3m 37s
build_js_types	1m 14s
build_fantom_runner	11m 19s
test_js (22)	3m 54s
test_e2e_android_rntester / test (release)	6m 57s
test_e2e_android_rntester / test (debug)	7m 35s
test_e2e_android_templateapp	0s
test_e2e_ios_templateapp	0s
test_e2e_android_templateapp_retry_1	0s
build_npm_package	0s
test_android_helloworld	0s
test_e2e_ios_templateapp_retry_1	0s
test_e2e_android_templateapp_retry_2	0s
test_e2e_ios_templateapp_retry_2	0s
run_fantom_tests / test	3m 11s
run_fantom_tests / report	2s
run_fantom_tests_retry_1	0s
run_fantom_tests_retry_2	0s
test_e2e_android_rntester / report	2s
test_e2e_android_rntester_retry_1	0s
test_e2e_android_rntester_retry_2	0s
	56m 49s

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