[clang-tools-extra] [clang-tidy] Add avoid-pragma-once. (PR #140388)

[Baranov Victor via cfe-commits]

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@@ -351,6 +351,7 @@ Clang-Tidy Checks
    :doc:`performance-type-promotion-in-math-fn <performance/type-promotion-in-math-fn>`, "Yes"
    :doc:`performance-unnecessary-copy-initialization <performance/unnecessary-copy-initialization>`, "Yes"
    :doc:`performance-unnecessary-value-param <performance/unnecessary-value-param>`, "Yes"
+   :doc:`portability-avoid-pragma-once <portability/avoid-pragma-once>`, "Yes"
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vbvictor wrote:

```suggestion
   :doc:`portability-avoid-pragma-once <portability/avoid-pragma-once>`,
```
No auto fix-its

https://github.com/llvm/llvm-project/pull/140388