implement SuppressedError builtin (ES2024, required for using / await using runtime semantics)

[Nakshatra480]

Summary

Boa is missing the SuppressedError builtin, which is part of the ECMAScript 2024
standard. This is a blocking gap for the Explicit Resource Management feature
(using / await using) - without it, the engine cannot correctly handle errors
that occur during resource disposal as required by the DisposeResources abstract
operation.

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Current Behavior

Calling SuppressedError in Boa throws a ReferenceError because the constructor
does not exist:

new SuppressedError(new Error("dispose failed"), new Error("original"), "suppressed")
// ReferenceError: SuppressedError is not defined

Additionally, if a using block exits with an error and [Symbol.dispose]() also
throws, the engine has no mechanism to wrap both errors — the original error is
silently lost.

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Expected Behavior

SuppressedError should be available as a global builtin that inherits from
Error.prototype, with the following constructor signature:

new SuppressedError(error, suppressed [, message])

And expose the following instance properties:

Property	Description
.error	The new error thrown during disposal
.suppressed	The original error that was suppressed
.message	Optional message string, defaults to ""
.name	"SuppressedError"
.stack	Inherited from Error.prototype

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Acceptance Criteria

• SuppressedError is available as a global constructor
• new SuppressedError(error, suppressed, message) correctly sets .error,
  .suppressed, and .message properties
• SuppressedError.prototype inherits from Error.prototype
• SuppressedError.prototype.name is "SuppressedError"
• new SuppressedError() instanceof Error returns true
• new SuppressedError() instanceof SuppressedError returns true
• A SuppressedError variant is added to JsNativeErrorKind so the VM can
  throw it natively from Rust-side disposal logic
• All relevant test262 tests for SuppressedError pass

Implementation note: The closest reference in the codebase is AggregateError
in core/engine/src/builtins/error/aggregate.rs - SuppressedError should follow
the same pattern. Files to touch:

File	Change
core/engine/src/builtins/error/suppressed.rs	[new]
core/engine/src/builtins/error/mod.rs	[modify] Register as native error
core/engine/src/context/intrinsics.rs	[modify] Add to standard constructors
core/engine/src/error.rs	[modify] Add SuppressedError to JsNativeErrorKind

---

Spec Reference

• SuppressedError constructor: tc39.es/ecma262/#sec-suppressederror-constructor
• DisposeResources abstract operation: tc39.es/ecma262/#sec-disposeresources
• Explicit Resource Management proposal: github.com/tc39/proposal-explicit-resource-management

[jedel1043]

Assigning this to @abhinavs1920 since they're the ones implementing the feature