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Kanishk Dudeja ba77d15d41 chore(billing): remove billing address modal and tax id banner (#46210)
This PR removes the billing address modal and tax id banner code
completely since we no longer need it.

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## Summary by CodeRabbit

* **Removed Features**
  * Billing address update modal is no longer accessible.
  * Tax ID banner has been removed from the app UI.
  * Placeholder banner block disabled.

* **Tests**
  * Automated tests for the billing address modal were removed.

* **Chores**
  * Associated local-storage key for the tax ID banner was removed.

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2026-05-21 18:30:18 +05:30
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