[fix][CGS][entrance] fix dependency injection failure in entrance configuration

[v-kkhuang]

What is the purpose of the change

Background/Problem:
Dependency injection failure occurs in certain components during service startup, particularly in Entrance configuration and Flink plugin. This causes services to fail to start properly and affects system stability.

Purpose of Change:
To address this issue, this PR fixes the dependency injection problems in Entrance configuration and improves exception comments for better debugging and troubleshooting.

Value/Impact:
After the change, services can start properly without dependency injection errors, improving system reliability and maintainability.

Related issues/PRs

Related issues: close #979
Related pr:none

Brief change log

• Fix dependency injection failure in Entrance configuration
• Fix dependency injection issues in Flink plugin
• Improve exception comments for better debugging

Checklist

• I have read the Contributing Guidelines on pull requests.
• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible
• If this is a code change: I have written unit tests to fully verify the new behavior.

[casionone]

LGTM.