Fix #25083: Allow bracket notation for enum keys in computed properties

[RodrigoSanchezDev]

Fixes #25083

This PR enables bracket notation (e.g., Type['key']) to work alongside dot notation (Type.key) when using enum members as computed property names in type literals.

Problem: Bracket notation was rejected even though it resolves to the same literal type.

Solution: Modified isLateBindableAST to accept ElementAccessExpression when the base is an EntityNameExpression.

Testing: Added comprehensive test case covering identifier and non-identifier enum keys.

This makes TypeScript more consistent by treating Type.Foo and Type['Foo'] equivalently in computed property contexts.

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[Copilot]

Pull request overview

This PR fixes issue #25083 by enabling bracket notation (Type['key']) for enum members in computed property names within type literals, making it consistent with the existing dot notation (Type.key).

Changes:

• Modified isLateBindableAST to accept ElementAccessExpression when the base is an EntityNameExpression
• Added comprehensive test coverage for both identifier and non-identifier enum keys using bracket notation