fix: resolve silent failures in 'algokit project deploy' by improving error logging

[Tusharkhadde]

Description

This PR resolves an issue where algokit project deploy would fail silently when errors occurred in the deployment configuration (e.g., an ImportError in deploy_config.py).

The silent failure was primarily caused by two factors:

1. Encoding Sensitivity: Subprocess output containing non-UTF-8 characters could cause the output reader to crash, silencing the error.
2. Missing Error Fallback: The deploy command lacked an explicit fallback to display captured subprocess output when a failure occurred, relying solely on real-time logging which could be suppressed or interrupted.

Changes

• src/algokit/core/proc.py: Added errors="backslashreplace" to proc.run to ensure that decoding errors in subprocess output are handled gracefully rather than crashing the CLI.
• src/algokit/cli/project/deploy.py: Added explicit logging of the captured subprocess output (at the ERROR level) whenever the deployment command exits with a non-zero code. This aligns the behavior with the project run command.

Verification

Verified using a reproduction script that triggers an ImportError and produces non-UTF-8 output. The CLI now correctly displays the Python traceback and error context even if real-time logging is insufficient.

Related Issues

Closes #710