EasyCLA email template support link still points to Jira instead of Intercom

[mlehotskylf]

EasyCLA notification emails (e.g. "CLA has been signed") include a "reach out to us for support" link that points to a Jira Service Desk portal, but support has moved to Intercom.

Hardcoded in:

• cla-backend-go/utils/email.go:113
• cla-backend-legacy/internal/api/handlers.go:2642

Both reference: https://jira.linuxfoundation.org/servicedesk/customer/portal/4/create/143

Should be updated to the Intercom support link.

Please inspect other email templates as well.

[mlehotskylf]

Juansebastian Arias  [11:32 AM]
This will change on a later milestone, but to keep the consistency for now, I'd say to send them to the landing page and interact with the bot, as we did for the other ones.

[lukaszgryglicki]

PR up: #5172.

[lukaszgryglicki]

Similar prod PR: #5173.