fix: use redis cache for github token connections (CM-922)

[themarolt]

Use redis cache for github token connections so we don't fetch them every time.

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Note

Low Risk
Low risk: changes are limited to scheduling and an optimization via Redis caching; main risk is stale cache causing temporary failures to find token connections until invalidated/expired.

Overview
Reduces Nango GitHub connection creation overhead by caching the list of github-token-* connection IDs in Redis (30-day TTL) and reusing it instead of fetching all Nango connections each time; adds invalidateGithubTokenConnectionIdsCache and exports it from activities.

Adjusts the nango-connection-cleanup cron schedule to run weekly (non-dev) instead of daily.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.