Rest_Deploy ignores errors

[yippie]

Describe the bug

If an error happens deploying metadata using the deploy task and rest_deploy option, the task prints the error but then reports success and the flow (and metadeploy plan) happily continue.

This is because the Rest_Deploy.py class that handles it never throws errors for any reason, it catches and prints the error, but then returns success.

Reproduction steps

1. Have a deploy task with rest_deploy: True
2. Deploy source that will fail to deploy for any reason
3. EXPECTED: task to fail and return with an error code
4. ACTUAL: task reports success despite printing the error and flow or script will continue thinking it succeeded.

Your CumulusCI and Python versions

CumulusCI version: 4.6.0 (/usr/local/bin/cci)
Python version: 3.13.5 (/opt/pipx/venvs/cumulusci/bin/python)

Operating System

macOS 26.2

Windows environment

No response

CumulusCI installation method

pipx

Error Gist

No response

Additional information

No response