Fix identifier unicode escaping for parameter props

[jakebailey]

The original code was:

        // TODO(rbuckton): Does this need to be parented?
        const propertyName = setParent(setTextRange(factory.cloneNode(name), name), name.parent);
        setEmitFlags(propertyName, EmitFlags.NoComments | EmitFlags.NoSourceMap);

        // TODO(rbuckton): Does this need to be parented?
        const localName = setParent(setTextRange(factory.cloneNode(name), name), name.parent);
        setEmitFlags(localName, EmitFlags.NoComments);

To answer the TODO... yes, apparently.

[Copilot]

Pull request overview

Fixes a codegen discrepancy in the TypeScript runtime-syntax transformer where cloned identifier nodes for parameter properties lost their parent pointers, causing the printer to emit normalized identifier text instead of preserving original unicode escape sequences.

Changes:

• Set Parent on cloned propertyName/localName identifiers emitted for parameter-property constructor assignments.
• Update the escapedIdentifiers reference baseline to reflect preserved unicode escapes in this.<prop> = <param> assignments.
• Remove the now-unnecessary escapedIdentifiers.js.diff baseline diff file.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
internal/transformers/tstransforms/runtimesyntax.go	Ensures cloned parameter-property identifiers are parented so the printer can recover escaped source text.
testdata/baselines/reference/submodule/compiler/escapedIdentifiers.js	Updates expected emit output to keep unicode escapes for parameter-property assignments.
testdata/baselines/reference/submodule/compiler/escapedIdentifiers.js.diff	Removes the diff baseline since the outputs now match.