Fix #4848: Prevent seed script crash in non-interactive environments

[5hank6]

Summary

This PR fixes a crash in the database seed process when EvalAI is run in non-interactive environments such as Docker or CI pipelines.

Problem

The scripts/seed.py script prompts for user confirmation using input() when existing database data is detected.
When executed in non-interactive environments (e.g. during docker-compose up), this causes an EOFError and prevents the Django container from starting.

Solution

• Automatically bypass the interactive prompt in non-interactive or test environments.
• Safely proceed with reseeding instead of crashing.
• Preserve the confirmation prompt for interactive/local usage.

Testing

• Ran docker-compose up locally.
• Verified that the Django container starts successfully and the seed process completes without errors.

Fixes #4848

[5hank6]

Hi maintainers

I’ve traced the Travis failure down to a strict dependency conflict introduced by newer pip resolution:

• cfn-lint==0.48.3 requires networkx==2.4
• worker_py3_9.txt was pinning networkx==3.2.1, which makes the dependency graph unsatisfiable

To fix this, I’m proposing:

• pin networkx==2.4 (matching cfn-lint’s requirement)
• keep PyYAML<6 via a constraints file to stay compatible with docker-compose==1.27.4

Local docker-compose build passes with this setup.
Before pushing further CI-related changes, I wanted to confirm this aligns with the project’s expectations.

Thanks!