Recommended Deletions of Collections

[zghera]

Issue summary

Consider using the recommended method to delete collections in production as described here.

Expected behavior

Implement a trip deletion method that takes into account error handling, security, (easy) deleting sub-collections, and maximizing performance using a Callable Cloud Function as described here.

Actual behavior

When deleting a trip and its associated sub-collection of activities, the current method in PR 8x uses the methods described in the documentation here.

Steps to reproduce (including any preconditions)

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Your environment

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