feat(EMS-4000): application submission - conditional email template

[ttbarnes]

Introduction ✏️

This PR updates the application submission emails logic so that a different "confirmation" email will be sent if the application is:

• A multiple contract policy.
• The MAXIMUM_BUYER_WILL_OWE field is £25,000 or less.

If the above conditions are true, an exporter is potentially eligible "Small Export Builder".

Resolution ✔️

• Restructure the CONFIRMATION email template ID constants.
• Create new helper function, getSubmittedConfirmationTemplateId.
• Update application version constants.
• Update application.submittedEmail to pass templateId via getSubmittedConfirmationTemplateId.
• Update unit tests.
• Add E2E tests for specifically submitting a multiple contract policy with:
  • MAXIMUM_BUYER_WILL_OWE below the threshold.
  • MAXIMUM_BUYER_WILL_OWE above the threshold.

Miscellaneous ➕

• Minor documentation improvement.
• E2E cypress command improvements.
• Align application versions.
• Minor content string improvements.