feat: fetch email from snapchat oauth provider if available for consistency (#2110)

## What kind of change does this PR introduce?
This is an update to the existing Snapchat OAuth provider, which was
previously not capable of Email field. Now if Email field is present in
the response, it is handled accordingly

## What is the current behavior?
Current behaviour is that Email field is never handled in the Snapchat
provider

## What is the new behavior?
New behaviour is that if Email is present in the response - it is set to
claims accordingly

Co-authored-by: Stojan Dimitrovski <sdimitrovski@gmail.com>

Author: ymiedviediev

internal/api/external_snapchat_test.go

@@ -10,7 +10,7 @@ import (
 )
 
 const (
-	snapchatUser = `{"data":{"me":{"externalId":"snapchatTestId","displayName":"Snapchat Test","bitmoji":{"avatar":"http://example.com/bitmoji"}}}}`
+	snapchatUser = `{"data":{"me":{"email":"snapchattestid@snapchat.id","externalId":"snapchatTestId","displayName":"Snapchat Test","bitmoji":{"avatar":"http://example.com/bitmoji"}}}}`
 )
 
 func (ts *ExternalTestSuite) TestSignupExternalSnapchat() {

internal/api/provider/snapchat.go

@@ -31,6 +31,7 @@ type snapchatUser struct {
 			Bitmoji     struct {
 				Avatar string `json:"avatar"`
 			} `json:"bitmoji"`
+			Email string `json:"email"`
 		} `json:"me"`
 	} `json:"data"`
 }
@@ -94,7 +95,13 @@ func (p snapchatProvider) GetUserData(ctx context.Context, tok *oauth2.Token) (*
 
 	data := &UserProvidedData{}
 
-	// Snapchat doesn't provide email address!
+	if u.Data.Me.Email != "" {
+		data.Emails = []Email{{
+			Email:    u.Data.Me.Email,
+			Verified: true,
+			Primary:  true,
+		}}
+	}
 
 	data.Metadata = &Claims{
 		Issuer:  IssuerSnapchat,