React to the Smooch trigger related to story mention.

[caiosba]

Description

The tipline bot should react to the Smooch trigger that happens when a connected Instagram account is mentioned in a story. This is required in order for the Facebook app to be approved.

Fixes: CV2-3727.

How has this been tested?

Manually. When a public Instagram account mentions in a story an Instagram account that is connected to a Check tipline, the tipline bot should respond.

Checklist

• I have performed a self-review of my own code
• I have added unit and feature tests, if the PR implements a new feature or otherwise would benefit from additional testing
• I have added regression tests, if the PR fixes a bug
• I have added logging, exception reporting, and custom tracing with any additional information required for debugging
• I considered secure coding practices when writing this code. Any security concerns are noted above.
• I have commented my code in hard-to-understand areas, if any
• I have made needed changes to the README
• My changes generate no new warnings
• If I added a third party module, I included a rationale for doing so and followed our current guidelines

[codeclimate]

Code Climate has analyzed commit 23257b0 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (100% is the threshold).

This pull request will bring the total coverage in the repository to 99.9% (0.0% change).

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