Port TypeScript PR #62950: Ignore computed name parents when looking up containing functions

[Copilot]

Ports microsoft/TypeScript#62950

When looking up containing functions from within a computed property name (e.g., [yield 0]), the compiler would incorrectly treat the method being defined as the containing function, causing infinite recursion during contextual typing.

function* g() {
  let x: any = {
    *[yield 0]() {}  // yield should be in context of g(), not the method
  };
}

Changes

• GetContainingFunction (internal/ast/utilities.go): Skip over ComputedPropertyName nodes by jumping to node.Parent.Parent
• getContainingFunctionOrClassStaticBlock (internal/checker/utilities.go): Same fix
• getContainingClassStaticBlock (internal/checker/utilities.go): Added new function with same computed property name handling, for parity with TypeScript

This also fixes await expressions in computed property names inside class static blocks now correctly reporting errors.

Original prompt

Port microsoft/TypeScript#62950

Custom agent used: Strada to Corsa Port Expert
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