Add tenacity retries to secrets file creation

[adamtheturtle]

This updates admin/create_secrets_files.py to use explicit tenacity retry policies for timeout-prone Selenium operations. Database and VuMark creation/detail retrieval now raise TimeoutException and are wrapped with retries that stop after three attempts with exponential backoff. The main loop now handles exhausted retries by resetting the driver and continuing to the next attempt, preserving the existing workflow while making retry behavior bounded and clearer. The tenacity call signatures were adjusted to keyword arguments to satisfy strict mypy checks in pre-push hooks.

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Note

Low Risk
Low risk: changes are limited to an admin script and mainly adjust timeout handling by retrying and failing fast after bounded attempts.

Overview
Makes secrets-file generation more resilient to flaky Selenium timeouts by introducing a shared tenacity RETRY_ON_TIMEOUT policy (3 attempts with exponential backoff) around database/VuMark detail retrieval.

Refactors helper functions to always return details (no None) and lets TimeoutException propagate after retries; the main loop now catches exhausted timeouts, logs a clearer error, resets the web driver, and continues to the next file.

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