Add CLI support for notification management

[alicenstar]

Summary

• Add a top-level notification command for subscription, event, email, and webhook management
• Add vendor v3 client and types for all notification APIs
• Add CLI validation and client tests for the new notification flows

Shortcut story: https://app.shortcut.com/replicated/story/135446/cli-support-for-notification-management

Backend counterpart: replicatedhq/vandoor#9650

Commands added

Command	Description
notification subscription ls	List notification subscriptions
notification subscription get ID	Get a subscription by ID
notification subscription create --file FILE	Create a subscription from a JSON file
notification subscription update ID --file FILE	Update a subscription from a JSON file
notification subscription rm ID	Delete a subscription
notification subscription events ID	List delivery events for a subscription
notification event ls	List all notification delivery events
notification event retry EVENT_ID	Retry a failed notification event
notification event-type ls	List available event types (supports -q search and --limit)
notification email resend-verification --email EMAIL	Resend a verification email
notification email verify --email EMAIL --code CODE	Verify an email address
notification webhook test --file FILE	Send a test payload to a webhook URL

Test output

star@StarR-CK2R4J3VHV replicated % ./bin/testrep notification event-type ls --q customer
KEY                           DISPLAY NAME                        CATEGORY    DESCRIPTION
customer.created              Customer Created                    Customer    When a new customer is created
customer.updated              Customer Updated                    Customer    When a customer's details or license is updated
customer.archived             Customer Archived                   Customer    When a customer is archived
customer.unarchived           Customer Unarchived                 Customer    When a customer is restored from archived state
customer.license_expiring     Customer License Expiring           Customer    When a customer's license is approaching expiration
customer.pending_signup       Pending Self-Service Signup         Customer    When someone signs up for a trial via self-service
customer.ep_invite_sent       Enterprise Portal Invite Sent       Customer    When an Enterprise Portal invite is sent to a user
customer.ep_access_granted    Enterprise Portal Access Granted    Customer    When a customer first accesses the Enterprise Portal for a given license type
customer.ep_user_joined       Enterprise Portal User Joined       Customer    When a user joins an Enterprise Portal customer (invite acceptance, self-signup, or SAML JIT)
release.asset_downloaded      Release Asset Downloaded            Release     When a release asset (such as a Helm chart or .tgz bundle) is pulled by a customer


star@StarR-CK2R4J3VHV replicated % ./bin/testrep notification subscription ls
ID                                  NAME                                            TYPE       DESTINATION                                                                        ENABLED    VERIFIED
42c051231677dcb67d4c605b25881d79    release.build_failed                            email      star@replicated.com                                                                true       true
ba4619e7b11b6c8c3701e41d365e7083    3 event types                                   email      star@replicated.com                                                                true       true
b2d65d09f99fd128c23707e7f681553a    2 event types                                   webhook    https://hooks.slack.com/services/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    true       -
3645fa47f77687442016d7691b91216f    Customer Updated Notification Test (Marc W.)    email      marcw@replicated.com                                                               true       false
ad6d4cf4a41af4f60b5f0fa0e5f06e4d    14 event types                                  webhook    https://webhook.site/9d2888ba-81b8-495f-9a18-18c826387194                          false      -
41c200225ff89372491417fe0866c20c    customer.created                                email      grant@replicated.com                                                               true       true
ef4a53735a0b6c0da48e0b10307840dc    release.created                                 email      grant@replicated.com                                                               true       true

star@StarR-CK2R4J3VHV replicated %  ./bin/testrep notification subscription create --file /tmp/sub.json
ID                                  NAME                 TYPE     DESTINATION            ENABLED    VERIFIED
d2f144ee21db632798316779daf3c7bd    test subscription    email    star@replicated.com    true       true

Flow for verifying emails:

star@StarR-CK2R4J3VHV replicated % ./bin/testrep notification email resend-verification --email star+newnew@replicated.com
SUCCESS    MESSAGE
true       Verification email sent successfully

star@StarR-CK2R4J3VHV replicated % ./bin/testrep notification email verify --email star+newnew@replicated.com --code GOT25I
SUCCESS    MESSAGE
true       Email address verified successfully