feat(goTo): add postAuth and modules

[immdipu]

• Added postAuth for GoTo. We need it to fetch the accountKey from /admin/rest/v1/me, GoTo API endpoints require it.
• Split GoTo into two modules: goTo (api.getgo.com, default) and goToConnect (api.goto.com), since the two share auth but live on different base URLs.

[Copilot]

Pull request overview

Adds post-authentication metadata retrieval to the GoTo connector (to discover accountKey) and updates the GoTo provider catalog to support two modules with different base URLs, along with a manual smoke test program.

Changes:

• Introduce providers/goto connector implementation with GetPostAuthInfo() that fetches accountKey from /admin/rest/v1/me.
• Update providers/goTo.go catalog entry to require post-auth info and define goTo + goToConnect modules.
• Add test/goto helper + test/goto/auth-metadata manual smoke test to print the retrieved accountKey.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
test/goto/connector.go	Adds a test helper to construct an authenticated GoTo connector instance from local creds.
test/goto/auth-metadata/main.go	Adds a manual go run smoke test to call GetPostAuthInfo() and log the accountKey.
providers/goto/connector.go	Defines the GoTo connector struct and NewConnector() using internal/components.
providers/goto/authmetamodel.go	Adds a small model helper for accountKey post-auth catalog vars.
providers/goto/authmetadata.go	Implements post-auth discovery call to /admin/rest/v1/me and returns CatalogVars.
providers/goTo.go	Updates the GoTo ProviderInfo to require post-auth metadata and introduces module definitions.