Options for PDF export to honor hide_parameters and titled flags

**What problem will this feature request solve?**
Exporting a dashboard to PDF always renders the header, title, tab bar, and filter chips, which creates visual noise for automated snapshots.

Interactive embedding already supports hiding chrome with flags like titled=false, hide_parameters=, and bordered=false; the PDF export must honor these same flags for parity.

This aligns with an existing request reference metabase/metabase#58530

The issue impacts automated report delivery where recipients don’t need the chrome, just the dashboard body, and is currently not configurable for PDFs.

**Describe the solution you'd like.**
There should be a method for hiding title & parameters on PDF, like a toggle for these elements.

**How does this feature request impact you?**
This adds visual noise that can undesired when sending PDF subscriptions to end customers.

**Additional information**
This is in part a consequence of https://github.com/metabase/metabase/issues/35475

Start by tracing the PDF export path and comparing it with interactive embedding, focusing on the existing titled, hide_parameters, and bordered flags. Done means PDF exports honor the requested chrome-hiding options and automated dashboard snapshots can omit the header, title, tab bar, and filter chips; use issue #58530 and issue #35475 for context.

Written by the indexing model from the issue text.