Fix invalid outline navigation in search editor

[Copilot]

Clicking an outline entry for a search editor opened a new tab and failed with Unable to resolve resource search-editor:#0.<random>. The search editor's underlying text model uses an internal search-editor: URI that has no resource-based editor resolver (only the .code-search file extension is registered), so DocumentSymbolsOutline.reveal could not round-trip through IEditorService.openEditor.

Changes

• documentSymbolsOutline.ts: In reveal, when the outline's model URI matches the source editor's current model and the user isn't requesting side-by-side, apply the selection in place on this._editor instead of delegating to ICodeEditorService.openCodeEditor. This mirrors the existing in-place special case used by CodeEditorService.doOpenCodeEditorFromDiff for diff editors and avoids resolving a resource that the editor service cannot open.

if (!sideBySide && isEqual(this._editor.getModel()?.uri, model.uri)) {
    this._editor.setSelection(selection);
    this._editor.revealRangeNearTopIfOutsideViewport(selection, ScrollType.Smooth);
    this._editor.focus();
    return;
}

Side-by-side opens and cross-editor navigation paths are unchanged.