BRP-17278 Add scope filter for SubscriptionsQuery (#780)

# [[BRP-17278](https://bigcommercecloud.atlassian.net/browse/BRP-17278)]

## What changed?
Provide a bulleted list in the present tense
* Adding in the new scope filters that we are adding as a part of the
other PR's in this ticket to allow for end users to filter by scope
(store's in this case)

## Anything else?
Add related PRs, salient notes, ticket numbers, etc.
bigcommerce/merchant-subscription-manager#345
bigcommerce/api-proxy-java#3340

ping {names}


[BRP-17278]:
https://bigcommercecloud.atlassian.net/browse/BRP-17278?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

docs/integrations/apps/unified-billing/example-queries.mdx

@@ -911,6 +911,8 @@ Filters can also be used to query subscriptions.
 The supported filters are
 * `productId`
 * `productType`
+* `scopeId`
+* `scopeType`
 * `updatedAfter`
 * `status`
 * `ids`
@@ -982,5 +984,17 @@ The supported filters are
        }
     }
     ```
+
+
+    Use `scopeId` and `scopeType` filters together to retrieve specific subscriptions for a given scope:
+
+    ```json filename="Scope filters" showLineNumbers copy
+    {
+       "filters": {
+           "scopeId": "bc/account/scope/9godyw034y",
+           "scopeType": "STORE"
+       }
+    }
+    ```
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