fix(extend): improve signature of interface ExpectExtendMap (#27124)

Jest custom matcher support both `string` and `() => string` for message property
> d3a6a7400a/packages/expect/src/index.js (L351)

types/jest/index.d.ts

@@ -342,7 +342,7 @@ declare namespace jest {
     }
 
     interface ExpectExtendMap {
-        [key: string]: (this: MatcherUtils, received: any, ...actual: any[]) => { message(): string, pass: boolean } | Promise<{ message(): string, pass: boolean }>;
+        [key: string]: (this: MatcherUtils, received: any, ...actual: any[]) => { message(): string | (() => string), pass: boolean } | Promise<{ message(): string, pass: boolean }>;
     }
 
     interface SnapshotSerializerOptions {