Merge bitcoin/bitcoin#26601: test: Move wallet tests to wallet_*.py

fa7d71accc test: Move rpc_fundrawtransaction.py to wallet_fundrawtransaction.py (MarcoFalke)
fa933d6985 test: Move feature_backwards_compatibility.py to wallet_backwards_compatibility.py (MarcoFalke)

Pull request description:

  The tests only tests the wallet and it doesn't make sense to extend it for other stuff, so clarify that.

ACKs for top commit:
  fanquake:
    ACK fa7d71accc
  pablomartin4btc:
    re-ACK https://github.com/bitcoin/bitcoin/commit/fa7d71acccab4e5b416c9dd1e2080a9652107f84

Tree-SHA512: 9dc131ed8ff119bd6d43d04ecc5c96d02f2d6fdc3d0805492774a414c0fbe6a984da7631154122a080c54ddd25fc5a5bdd52b282c918fce4932057ba72c2bf71

test/functional/test_framework/test_node.py

@@ -337,7 +337,7 @@ class TestNode():
             return
         self.log.debug("Stopping node")
         try:
-            # Do not use wait argument when testing older nodes, e.g. in feature_backwards_compatibility.py
+            # Do not use wait argument when testing older nodes, e.g. in wallet_backwards_compatibility.py
             if self.version_is_at_least(180000):
                 self.stop(wait=wait)
             else:

test/functional/test_runner.py

@@ -98,8 +98,8 @@ BASE_SCRIPTS = [
     'mining_getblocktemplate_longpoll.py',
     'feature_maxuploadtarget.py',
     'feature_block.py',
-    'rpc_fundrawtransaction.py --legacy-wallet',
-    'rpc_fundrawtransaction.py --descriptors',
+    'wallet_fundrawtransaction.py --legacy-wallet',
+    'wallet_fundrawtransaction.py --descriptors',
     'p2p_compactblocks.py',
     'p2p_compactblocks_blocksonly.py',
     'feature_segwit.py --legacy-wallet',
@@ -226,8 +226,8 @@ BASE_SCRIPTS = [
     'wallet_txn_doublespend.py --legacy-wallet',
     'wallet_multisig_descriptor_psbt.py --descriptors',
     'wallet_txn_doublespend.py --descriptors',
-    'feature_backwards_compatibility.py --legacy-wallet',
-    'feature_backwards_compatibility.py --descriptors',
+    'wallet_backwards_compatibility.py --legacy-wallet',
+    'wallet_backwards_compatibility.py --descriptors',
     'wallet_txn_clone.py --mineblock',
     'feature_notifications.py',
     'rpc_getblockfilter.py',

test/functional/wallet_backwards_compatibility.py

@@ -7,10 +7,6 @@
 Test various backwards compatibility scenarios. Requires previous releases binaries,
 see test/README.md.
 
-v0.15.2 is not required by this test, but it is used in wallet_upgradewallet.py.
-Due to a hardfork in regtest, it can't be used to sync nodes.
-
-
 Due to RPC changes introduced in various versions the below tests
 won't work for older versions without some patches or workarounds.