[RN][Changelog] Add changelog for v0.86.0-rc.0 #38850

Job	Run time
lint	2m 1s
set_release_type	4s
check_code_changes	9s
prebuild_apple_dependencies	0s
test_ios_rntester_dynamic_frameworks	0s
build_debugger_shell	0s
build_android	0s
test_ios_rntester_ruby_3_2_0	0s
test_e2e_android_rntester	0s
prebuild_react_native_core	0s
test_ios_helloworld	0s
test_ios_helloworld_with_ruby_3_2_0	0s
test_e2e_android_rntester_retry_1	0s
test_ios_rntester	0s
test_e2e_ios_templateapp	0s
test_android_helloworld	0s
build_npm_package	0s
test_e2e_ios_rntester	0s
test_e2e_ios_templateapp_retry_1	0s
test_e2e_ios_rntester_retry_2	0s
test_e2e_android_templateapp_retry_1	0s
test_e2e_android_rntester_retry_2	0s
test_e2e_android_templateapp	0s
test_e2e_ios_rntester_retry_1	0s
test_e2e_ios_templateapp_retry_2	0s
test_e2e_android_templateapp_retry_2	0s
build_fantom_runner	0s
test_js	0s
build_js_types	-1s
run_fantom_tests	-1s
run_fantom_tests_retry_1	-1s
run_fantom_tests_retry_2	0s
	2m 11s

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