[clang] [Clang] Add thousands-separator to "cannot allocate array; evaluated array bound [...] exceeds the limit" diagnostic (PR #211785)

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VachanVY wrote:

@AaronBallman @shafik ping.
I will proceed with fixing the test cases by adding the modified diagonostic message once I know I'm going in the right direction.

https://github.com/llvm/llvm-project/pull/211785