[clang-tools-extra] [clang-tidy] Rename `cert-flp30-c` to `bugprone-avoid-float-loop-counter` (PR #166571)

[Baranov Victor via cfe-commits]

https://github.com/vbvictor commented:

We should omit "avoid" in check name, name `bugprone-float-loop-counter` is concise but itself.

`avoid` is used when check category is generic like "cppcoreguidelines" or "readabilty". "bugprone" category means by default that we should avoid some language construct.

https://github.com/llvm/llvm-project/pull/166571