[TEST] Add FECFile slack alerts for openFEC/fec.gov data we depend on, test webforms

[exalate-issue-sync]

We should add FECFile slack alerts for openFEC/fec.gov data we depend on.

• Identify which endpoints/environments we need to monitor: https://docs.google.com/spreadsheets/d/1lIOn8kIwpCOMh6JCMZaiGH5v2h7Dzw-ac-5jpOSC6Jc/edit?gid=0#gid=0
• Add pingdom checks for test webform 1, openfec stage test form 1, make sure they don’t appear on fec.gov status pages: www.fec.gov/status or https://secure-stats.pingdom.com/x0blqgj29ogg
• Add existing endpoint check alerts to FECFile-alerts slack

QA Notes

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DEV Notes

Please create ticket for PROD environment in backlog prior to completion of this ticket (can add additional information discovered).

Design

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See full ticket and images here: FECFILE-1792