Rename forbid-line-continuations rule file to match rule name #4700

Job	Run time
ClangTidy	3m 28s
KytheXrefs	0s
KytheVerification	0s
x86_64 test	3m 27s
MacOsBuild	3m 1s
arm64 test	3m 29s
MacOsBuildDevTools	3m 5s
PrepareVSPlugin	2m 12s
x86_64 test-clang	3m 34s
RunBantBuildCleaner	3m 12s
arm64 test-clang	3m 28s
x86_64 test-nortti	3m 28s
VerifyFormatting	31s
x86_64 test-c++20	3m 31s
WindowsBuild	3m 0s
x86_64 test-c++23	3m 32s
x86_64 smoke-test	3m 23s
arm64 smoke-test	3m 26s
x86_64 asan	3m 33s
x86_64 asan-clang	3m 42s
x86_64 compile	3m 38s
arm64 compile	3m 34s
x86_64 compile-clang	3m 28s
arm64 compile-clang	3m 31s
x86_64 compile-static	3m 32s
arm64 compile-static	3m 30s
x86_64 compile-static-clang	3m 35s
arm64 compile-static-clang	3m 25s
x86_64 coverage	3m 32s
x86_64 clean	3m 37s
arm64 clean	3m 34s
📦 Release	1s
Build and deploy GitHub pages	1s
	1h 36m 0s

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