31798 Add validation for contact point email in IA

[loneil]

Issue #: /bcgov/entity#31798

Description of changes:
Add a validate email check in the Incorporation application validation to check the Contact Point email validation.
The contact point schema has a format of email but the jsonschema validation for draft7 (and newer) just verifies with a "does it have @ in it" (see format)

This addresses the validation mismatch between relying on that simple check and the more complex one done in Create UI here.

Use the same regex as used in the UI here in the API for check.

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[Copilot]

Pull request overview

This pull request adds email validation to the Incorporation Application filing to address a validation mismatch between the API and Create UI. The API now uses the same RFC 5322 compliant email regex pattern as the frontend.

Changes:

• Added validate_email function to common validations with RFC 5322 compliant regex pattern
• Integrated email validation into incorporation application validation flow
• Added comprehensive unit tests for email validation covering valid and invalid formats

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
legal-api/src/legal_api/services/filings/validations/common_validations.py	Added EMAIL_PATTERN constant and validate_email function to validate email format
legal-api/src/legal_api/services/filings/validations/incorporation_application.py	Imported and called validate_email function in incorporation application validation
legal-api/tests/unit/services/filings/validations/test_common_validations.py	Added comprehensive tests for validate_email function including edge cases
legal-api/tests/unit/services/filings/validations/test_incorporation_application.py	Added parametrized test for email validation in incorporation application context

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