when `self.noban_tx_relay=True`, the following flag
`-whitelist=noban,in,out@127.0.0.1`is added to `extra_args`
to speed up tx relay/mempool sync.
Before (all functional tests):
```
ALL | ✓ Passed | 1465 s (accumulated)
Runtime: 163 s
```
After:
```
ALL | ✓ Passed | 1374 s (accumulated)
Runtime: 153 s
```
This makes test duration shorter and hopefully solves some rare timeouts in interface_rest.py
This concludes backport of core#27114
https://github.com/bitcoin/bitcoin/pull/27114/commits/c985eb854cc86deb747caea5283c17cf51b6a983
Bypasses core#26970 and core#29822
Depends on D17114