feature: Create Env. Variable for the client secret path

[mrsabath]

Feature Description

The hardcode secret value should be replaced by env. variable.

agent-examples/a2a/slack_researcher/slack_researcher/config.py

Line 13 in c45f0db

secret_file_path: str = "/shared/secret.txt"

Proposed Solution

Replace the hardcoded path with env. variable. This has to be correlated with kagenti/kagenti#267

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Additional Context

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[anshikabharadwaj98]

kindly assign me this task