[AUD-1828] Remove routes from external documentation

[rickyrombo]

Description

These routes are not useful for third parties and add confusion. Removing them to make the API docs clearer.

Also updates the flask plugin to account for a new edge case.

Tests

Verified that swagger output looks as expected.

How will this change be monitored? Are there sufficient logs?

[raymondjacobson]

Does this fix the schemas too?

[gitguardian]

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3086103	Generic High Entropy Secret	b1e39a2	discovery-provider/integration_tests/tasks/test_anchor_program_indexer.py	View secret

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