build(types): disable preserveSymlinks in tsconfig

PNPM uses symlinks by default for `node_modules`
(see the [`node-linker`][1] options), which doesn't work with
[TypeScript's `preserveSymlinks: true`][2] setting.

This meant that the `d3-transition` types were not applying properly in
our code.

[1]: https://pnpm.io/npmrc#node-linker
[2]: https://www.typescriptlang.org/tsconfig/#preserveSymlinks

packages/mermaid/src/diagrams/class/classDb.ts

@@ -389,7 +389,6 @@ const setupToolTips = function (element: Element) {
       // @ts-ignore - getBoundingClientRect is not part of the d3 type definition
       const rect = this.getBoundingClientRect();
 
-      // @ts-expect-error - Incorrect types
       tooltipElem.transition().duration(200).style('opacity', '.9');
       tooltipElem
         .text(el.attr('title'))
@@ -399,7 +398,6 @@ const setupToolTips = function (element: Element) {
       el.classed('hover', true);
     })
     .on('mouseout', function () {
-      // @ts-expect-error - Incorrect types
       tooltipElem.transition().duration(500).style('opacity', 0);
       const el = select(this);
       el.classed('hover', false);