[Feature] Enable SMTP Authentication in Tenant UI

[i5okie]

Enable using authentication with SMTP

Nodemailer used in Tenant UI supports using authentication. This PR extends the code to allow setting secure, and providing user and password variables via the Helm values.

For additional information refer to the nodemailer documentation: https://nodemailer.com/smtp/#authentication

Thanks @loneil for your help!

[github-actions]

Deployment	Resource	Location
Traction
	Tenant UI	https://pr-974-traction-tenant-ui-dev.apps.silver.devops.gov.bc.ca
	Innkeeper UI	https://pr-974-traction-tenant-ui-dev.apps.silver.devops.gov.bc.ca/innkeeper
Aca-Py
	Admin Swagger	https://pr-974-traction-acapy-admin-dev.apps.silver.devops.gov.bc.ca/api/doc
	Tenant Proxy Swagger	https://pr-974-traction-tenant-proxy-dev.apps.silver.devops.gov.bc.ca/api/doc

Deployment URLs ready for review.

[loneil]

To test this on the deployed PR we can temporarily set reservation.auto_approve in from plugin-config.yml in the config-map to false (or update it in values-pr to false and redeploy). Then reservation requests on the PR will send emails.

Can test out when deployment goes through but looking at code it seems ok. Probably good global setting to have though don't think we'll ever need this as we'd likely always be using the gov smtp server in OCP where it doesn't need auth?

[esune]

Looks good assuming the testing with no auth credentials yields positive results. @loneil it's true that for BCGov OCP we would not need the auth credentials, but it's nice to have the option 😉

[i5okie]

Works. Tested with reservation.auto_approve set to false as per @loneil's comment.

[loneil]

Looks good! Tried out locally on VPN with secure false to confirm emails send