Fix length check for Regex BOL FindFirstChar optimization #55574
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For a beginning-of-line anchor, in FindFirstChar we use IndexOf to quickly skip ahead to the next \n. But we neglected to check to see whether that brought us past an explicitly specified end position. This just adds the missing check.
Fixes #55557
cc: @strobelleder, @dotnet/area-system-text-regularexpressions