Read IDEX partition CSV from imap_processing

[lacoak21]

Change Summary

closes #1327

Overview

Use the static idex partition info from imap_processing. Unfortunately I still need copies of "idex_10_day_CDF_names.csv" in imap_processing AND sds-data-manager because imap_processing is not a requirement for dagster right now and I would prefer to keep it that way. Dagster needs those files in custom_paritions.py.

File changes

• sds_data_manager/lambda_code/SDSCode/pipeline_lambdas/idex_l0_indexer.py
  • read static file from imap_processing

[Copilot]

Pull request overview

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Updates the IDEX L0 indexer to use the shared/static 10‑day partition (window boundary) CSV path from imap_processing rather than maintaining a local path in this repo.

Changes:

• Import IDEX_10_DAY_RANGES_PATH from imap_processing.idex.idex_constants.
• Remove the local IDEX_10_DAY_RANGES_PATH definition from this module.
• Adjust the file-existence check to handle non-Path types via Path(...).

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