Added handler for bad email error while stripe user creation

[FilinBrChaos]

https://linear.app/zapehr/issue/OTR-2419/rcm-ehr-when-taking-patient-payment-via-stripe-bad-email-address-fails

[Copilot]

Pull request overview

This PR improves Stripe customer handling in zambdas to prevent failures when a patient/guarantor email address is rejected by Stripe, and to ensure a Stripe customer exists before sending an invoice.

Changes:

• When creating a Stripe customer, catch invalid email errors and retry customer creation without an email address.
• When updating a Stripe customer, catch invalid email errors and retry the update without the email field.
• In the invoice-sending task, create a Stripe customer ID on-demand when it’s missing from the Account.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/zambdas/src/subscriptions/task/sub-send-invoice-to-patient/index.ts	Creates a Stripe customer ID on-demand instead of hard-failing when missing.
packages/zambdas/src/shared/stripeIntegration.ts	Adds retry logic for Stripe customer creation when Stripe rejects the email field.
packages/zambdas/src/ehr/shared/harvest/index.ts	Adds retry logic for Stripe customer updates when Stripe rejects the email field.

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