Add comprehensive test suite and install checks

[ehavazli]

Summary

• add a comprehensive pytest suite across CLI, geometry parsing, Landsat, Sentinel, NISAR, cloudiness, OPERA, and map generation
• add installation validation tests that check real dependency availability, imports, and CLI startup
• include pytest in the conda environment and fix the email/logging path in next_pass.py

Testing

• pytest -q
• python -m pytest -q tests/test_next_pass_cli.py

[ifenni]

didsnt run into any isssues with "pytest -q" or "python -m pytest -q tests/test_next_pass_cli.py" and with 65 passed in 34.55s for the first command and 10 passed in 4.39s for the second.