[clang] [analyzer] Move alpha checker EnumCastOutOfRange to optin (PR #67157)

[via cfe-commits]

DonatNagyE wrote:

Before merging this PR, the diagnostics of the EnumCast checker should be updated to mention the name of the `enum` type in question. @gamesh411 could you create a PR that implements this improvement (as we discussed)?

https://github.com/llvm/llvm-project/pull/67157