Enable disburse maturity for NNS neurons (#6942)

# Motivation

To simplify the process of claiming matured rewards and avoid the extra
steps of creating and disbursing a new neuron, the disburse maturity
feature is introduced for NNS neurons (this approach is already used for
SNS neurons).

This PR switches the feature flag to enable disburse maturity for NNS
neurons.

# Changes

- Enable `ENABLE_DISBURSE_MATURITY` feature flag.
- Ran `./scripts/nns-dapp/test-config --update` to update config files.

# Tests

- Verified locally that the feature is enabled by default.
- Since the "Spawn Neuron" button was replaced with "Disburse":
  - Updated multiple screenshots due to the button change.
- Added an end-to-end test for disburse maturity to replace the spawn
neuron test (this also updates screenshots, as after disburse maturity
the user remains on the neuron details page).

# Todos

- [x] Accessibility (a11y) – any impact?
- [x] Changelog – is it needed?

Author: mstrasinskis

CHANGELOG-Nns-Dapp-unreleased.md

@@ -15,6 +15,7 @@ proposal is successful, the changes it released will be moved from this file to
 #### Added
 
 * Visual feedback on copy to clipboard actions
+* Disburse maturity for NNS neurons
 
 #### Changed
 

config.json

@@ -98,7 +98,7 @@
         "FEATURE_FLAGS": {
           "ENABLE_CKTESTBTC": false,
           "DISABLE_IMPORT_TOKEN_VALIDATION_FOR_TESTING": false,
-          "ENABLE_DISBURSE_MATURITY": false,
+          "ENABLE_DISBURSE_MATURITY": true,
           "ENABLE_USD_VALUES": true,
           "ENABLE_USD_VALUES_FOR_NEURONS": true,
           "ENABLE_PORTFOLIO_PAGE": true,

frontend/src/tests/e2e/neurons-table.spec.ts

@@ -68,6 +68,10 @@ const createHotkeyNeuronsInOtherAccount = async ({
     .getNnsNeuronDetailPo()
     .addHotkey(hotkeyPrincipal);
   await appPo.getNeuronDetailPo().getNnsNeuronDetailPo().joinCommunityFund();
+
+  // close the success modal that could cover the button
+  await appPo.getToastsPo().closeAll();
+
   await appPo.getNeuronDetailPo().getNnsNeuronDetailPo().unlockNeuron();
   await page.close();
 };
@@ -118,20 +122,20 @@ test("Test neurons table", async ({ page, context, browser }) => {
   // Reload the page to see the maturity and enable the spawn neuron button.
   await page.reload();
 
-  step("Spawn a neuron");
-  await neuronDetail.spawnNeuron({ percentage: 100 });
+  step("Disburse maturity");
+  await neuronDetail.disburseMaturity({ percentage: 100 });
 
   step("Wait for the hotkey neurons to be created");
   await createHotkeyNeuronsPromise;
 
   await page.reload();
 
   step("Make screenshots");
-  await appPo.getNeuronsPo().getNnsNeuronsPo().waitForContentLoaded();
+  await appPo.getNeuronDetailPo().waitForContentLoaded();
 
   await replaceContent({
     page,
-    selectors: ['[data-tid="neuron-id"]'],
+    selectors: ['[data-tid="identifier"]'],
     pattern: /[0-9a-f]{7}...[0-9a-f]{7}/,
     replacements: replacementNeuronIds,
   });