Added new settings for portal button customization

no issue

- Adds new portal settings - `portal_button_style`, `portal_button_icon` and `portal_button_signup_text`
- New settings allows customization of portal button
- Updates tests to include new settings

core/server/data/schema/default-settings.json

@@ -290,6 +290,22 @@
         "portal_plans": {
             "defaultValue": "[\"free\", \"monthly\", \"yearly\"]",
             "type": "array"
+        },
+        "portal_button_style": {
+            "defaultValue": "icon-and-text",
+            "validations": {
+                "isEmpty": false,
+                "isIn": [["text-only", "icon-and-text", "icon-only"]]
+            },
+            "type": "string"
+        },
+        "portal_button_icon": {
+            "defaultValue": null,
+            "type": "string"
+        },
+        "portal_button_signup_text": {
+            "defaultValue": "Subscribe",
+            "type": "string"
         }
     },
     "email": {

test/regression/api/canary/admin/settings_spec.js

@@ -49,6 +49,9 @@ const defaultSettingsKeyTypes = [
     {key: 'portal_name', type: 'portal'},
     {key: 'portal_button', type: 'portal'},
     {key: 'portal_plans', type: 'portal'},
+    {key: 'portal_button_style', type: 'portal'},
+    {key: 'portal_button_icon', type: 'portal'},
+    {key: 'portal_button_signup_text', type: 'portal'},
     {key: 'mailgun_api_key', type: 'bulk_email'},
     {key: 'mailgun_domain', type: 'bulk_email'},
     {key: 'mailgun_base_url', type: 'bulk_email'},

test/regression/api/v2/admin/settings_spec.js

@@ -46,6 +46,9 @@ const defaultSettingsKeyTypes = [
     {key: 'portal_name', type: 'portal'},
     {key: 'portal_button', type: 'portal'},
     {key: 'portal_plans', type: 'portal'},
+    {key: 'portal_button_style', type: 'portal'},
+    {key: 'portal_button_icon', type: 'portal'},
+    {key: 'portal_button_signup_text', type: 'portal'},
     {key: 'mailgun_api_key', type: 'bulk_email'},
     {key: 'mailgun_domain', type: 'bulk_email'},
     {key: 'mailgun_base_url', type: 'bulk_email'},

test/regression/api/v3/admin/settings_spec.js

@@ -49,6 +49,9 @@ const defaultSettingsKeys = [
     'portal_name',
     'portal_button',
     'portal_plans',
+    'portal_button_style',
+    'portal_button_icon',
+    'portal_button_signup_text',
     'mailgun_api_key',
     'mailgun_domain',
     'mailgun_base_url',