feat: RBAC read params from body (#2846)

## About the changes
This is a follow-up on #1953

This implementation generalizes how we fetch some standard parameters
from the query parameters or request body.

## Discussion points
Unfortunately, we have not used standard names for our APIs and one
example is our `projectId` (in some cases we just used `project`).
Ideally, we're only using one way of sending these parameters either
`projectId` or `project` (same applies to `environment` vs
`environmentId`).

If both parameters are present, due to historical reasons, we'll give
precedence to:
- `projectId` over `project`
- `environment` over `environmentId` 

In the presence of both query parameters and body, we'll give precedence
to query parameters also for historical reasons.

src/lib/middleware/rbac-middleware.ts

@@ -1,4 +1,3 @@
-/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
 import {
     CREATE_FEATURE,
     DELETE_FEATURE,
@@ -18,6 +17,18 @@ interface PermissionChecker {
     ): Promise<boolean>;
 }
 
+function findParam(
+    name: string,
+    { params, body }: any,
+    defaultValue?: string,
+): string | undefined {
+    let found = params ? params[name] : undefined;
+    if (found === undefined) {
+        found = body ? body[name] : undefined;
+    }
+    return found || defaultValue;
+}
+
 const rbacMiddleware = (
     config: Pick<IUnleashConfig, 'getLogger'>,
     { featureToggleStore }: Pick<IUnleashStores, 'featureToggleStore'>,
@@ -44,16 +55,23 @@ const rbacMiddleware = (
                 return false;
             }
 
-            // For /api/admin/projects/:projectId we will find it as part of params
-            let { projectId, environment } = params;
+            let projectId =
+                findParam('projectId', req) || findParam('project', req);
+            let environment =
+                findParam('environment', req) ||
+                findParam('environmentId', req);
 
             // Temporary workaround to figure out projectId for feature toggle updates.
             // will be removed in Unleash v5.0
             if ([DELETE_FEATURE, UPDATE_FEATURE].includes(permission)) {
                 const { featureName } = params;
                 projectId = await featureToggleStore.getProjectId(featureName);
-            } else if (permission === CREATE_FEATURE) {
-                projectId = projectId || req.body.project || 'default';
+            } else if (
+                projectId === undefined &&
+                (permission == CREATE_FEATURE ||
+                    permission.endsWith('FEATURE_STRATEGY'))
+            ) {
+                projectId = 'default';
             }
 
             return accessService.hasPermission(