test: Bump timeouts in feature_index_prune and wallet_importdescriptors

Timeout issues where encountered when running functional tests with `--jobs=16 --extended`.

Line in `feature_index_prune.py` took 101.6s, 96.6s, 103.0s across 3 runs on my machine, default limit is 60.

Line in the `wallet_importdescriptors.py --descriptors` took 5.4s, 5.7s, 6.0s across 3 runs.

test/functional/feature_index_prune.py

@@ -31,7 +31,7 @@ def sync_index(self, height):
         expected_stats = {
             'coinstatsindex': {'synced': True, 'best_block_height': height}
         }
-        self.wait_until(lambda: self.nodes[1].getindexinfo() == expected_stats)
+        self.wait_until(lambda: self.nodes[1].getindexinfo() == expected_stats, timeout=150)
 
         expected = {**expected_filter, **expected_stats}
         self.wait_until(lambda: self.nodes[2].getindexinfo() == expected)

test/functional/wallet_importdescriptors.py

@@ -688,7 +688,7 @@ def run_test(self):
 
         encrypted_wallet.walletpassphrase("passphrase", 99999)
         with concurrent.futures.ThreadPoolExecutor(max_workers=1) as thread:
-            with self.nodes[0].assert_debug_log(expected_msgs=["Rescan started from block 0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206... (slow variant inspecting all blocks)"], timeout=5):
+            with self.nodes[0].assert_debug_log(expected_msgs=["Rescan started from block 0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206... (slow variant inspecting all blocks)"], timeout=10):
                 importing = thread.submit(encrypted_wallet.importdescriptors, requests=[descriptor])
 
             # Set the passphrase timeout to 1 to test that the wallet remains unlocked during the rescan