261d229455 test: Replace DEBUG_LOG_OUT with -printtoconsole=1 (Hodlinator)
Pull request description:
`-printtoconsole=1` has the same functionality but works in more cases than `DEBUG_LOG_OUT`, so remove the latter (`-printtoconsole` is already used when fuzzing). This means we can drop `G_TEST_LOG_FUN`.
---
Behavior can be verified through
```shell
ctest --test-dir build --debug
```
and checking for:
```
142: Test command: /home/hodlinator/bc/2/build/bin/test_bitcoin "--run_test=coinselector_tests" "--catch_system_error=no" "--log_level=test_suite" "--" "-printtoconsole=1"
...
142: 2026-03-26T13:40:02.169392Z [test] [../src/kernel/context.cpp:20] [operator()] Using the 'sse4(1way);sse41(4way);avx2(8way)' SHA256 implementation
```
---
Inspired by: https://github.com/bitcoin/bitcoin/pull/34918#discussion_r2994780532
ACKs for top commit:
nkatha23:
ACK 261d229
maflcko:
review ACK 261d229455📬
kevkevinpal:
crACK [261d229](261d229455)
janb84:
cr ACK 261d229455
Tree-SHA512: f4c793b4a00730ade113241baeaaef08ae0333df15ada5929dd46aacd1ac875733e58aa341fac8fb5875eb5ebca735d40c664bf0ef62132094e0c993da5b20e5