provide details for debugging failing test-thredds notebook

[fmigneault]

Overview

Adds general debugging utilities regarding notebook test_thredds

Changes

• Adds variable overrides in test_thredds for local debugging.
• Adds important documentation notes regarding possible error debugging leads for test_thredds (based on actual issues encountered).

Related Issue / Discussion

• Relates to https://github.com/bird-house/birdhouse-deploy/pull/188#issuecomment-895622277

[review-notebook-app[bot]]

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