[clang-tools-extra] [clang-tidy][NFC] Use universal containers mock (PR #186669)

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@@ -122,13 +124,11 @@ void okay() {
 namespace gh126424 {
 
 namespace std {
-template <typename, typename>
-class pair {};
 
 template <typename Key, typename Value>
 class map {
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EugeneZelenko wrote:

`map` mock?

https://github.com/llvm/llvm-project/pull/186669