IDEX l1b filter for desired evt messages

[lacoak21]

Change Summary

Overview

Filter the l1b event message dataset to only include messages that are for pulser on / off and science on/off

File changes

imap_processing/idex/idex_l1b.py

• Remove inds where both science on and pulser on are null

Testing

Update test

[Copilot]

Pull request overview

This PR updates IDEX L1B “msg” processing to drop event-message rows that don’t correspond to science acquisition on/off or pulser on/off, and adjusts the associated unit test expectations to reflect the filtered dataset.

Changes:

• Filter the L1B MSG dataset to exclude rows where both pulser_on and science_on are the 255 fill value.
• Update test_l1b_msg_processing expected indices to match the new filtered ordering.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
imap_processing/idex/idex_l1b.py	Filters MSG output dataset to keep only science/pulser on/off-related rows.
imap_processing/tests/idex/test_idex_l1b.py	Updates MSG processing test expectations for shifted indices after filtering.

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