Merge #21411: test: add logging, reduce blocks, move sync_all in wallet_ groups

c62f9bc0e931f65eef63041d2c53f9a294c0e8d6 test: use fewer blocks in wallet_groups and move sync call (Jon Atack)
3a16b5ef95c1c25f8b78e591f985e80b41a6dbdd test: add missing logging to wallet_groups.py (Jon Atack)

Pull request description:

  - add logging (particularly useful as the tests are somewhat slow)
  - generate 101 blocks instead of 110
  - move `sync_all` call into the loop, so fewer blocks are synced on each call, to hopefully see fewer CI timeouts as in https://bitcoinbuilds.org/index.php?ansilog=88eee99e-1727-44ed-b778-3b9c75c33928.log

  ```
  L2742     File "/home/ubuntu/src/test/functional/wallet_groups.py", line 162, in run_test
  L2743       self.sync_all()
  test_framework.authproxy.JSONRPCException: 'syncwithvalidationinterfacequeue' RPC took longer than 960.000000 seconds. Consider using larger timeout for calls that take longer to return. (-344)
  ```

ACKs for top commit:
  MarcoFalke:
    cr ACK c62f9bc0e931f65eef63041d2c53f9a294c0e8d6

Tree-SHA512: 711deafcd589cb8196cb207ff882e0f2ab6b70828a6abad91f83f535974cc430a56b9e8a960fd233d31d610932a0d48b49ee681aae564d145a3040288ecda8f8

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