Rename forbid-line-continuations rule file to match rule name #4701

Job	Run time
ClangTidy	6m 17s
MacOsBuild	4m 42s
x86_64 test	4m 8s
arm64 test	5m 20s
MacOsBuildDevTools	4m 16s
x86_64 test-clang	4m 27s
RunBantBuildCleaner	3m 20s
arm64 test-clang	5m 26s
x86_64 test-nortti	4m 25s
VerifyFormatting	26s
x86_64 test-c++20	4m 10s
x86_64 test-c++23	4m 56s
x86_64 smoke-test	11m 9s
KytheVerification	0s
arm64 smoke-test	11m 54s
KytheXrefs	0s
x86_64 asan	6m 58s
x86_64 asan-clang	5m 43s
PrepareVSPlugin	2m 12s
x86_64 compile	3m 37s
WindowsBuild	12m 34s
arm64 compile	3m 59s
x86_64 compile-clang	3m 21s
arm64 compile-clang	3m 57s
x86_64 compile-static	3m 2s
arm64 compile-static	4m 16s
x86_64 compile-static-clang	3m 3s
arm64 compile-static-clang	4m 25s
x86_64 coverage	15m 50s
x86_64 clean	7m 19s
arm64 clean	7m 18s
Build and deploy GitHub pages	7s
📦 Release	0s
	2h 42m 37s

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