[MAINTENANCE] build-gallery enhancements

[kenwade4]

Revert generated JSON file names before merge . . . Don't forget!

Changes proposed in this pull request:

• Update build_test_backends_list func with redshift/athena/snowflake
• Add trigger_algolia.sh script
• Update conftest options

Definition of Done

• [x] My code follows the Great Expectations style guide
• [x] I have performed a self-review of my own code
• [x] I have run any local integration tests and made sure that nothing is broken.

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