[clang-tidy] Enable readability-redundant-string-init (#16310)

.clang-tidy

@@ -132,7 +132,6 @@ Checks: >-
   -readability-redundant-inline-specifier,
   -readability-redundant-member-init,
   -readability-redundant-parentheses,
-  -readability-redundant-string-init,
   -readability-redundant-typename,
   -readability-uppercase-literal-suffix,
   -readability-use-anyofallof,