Change Summary

Overview

This PR grew larger than planned with a minor improvement in the SPICE related use_test_metakernel fixture.

Adds computing HAE (EclipticJ2000) lat/lon to the L1b processing
Simplifies use of use_test_metakernel fixture when specifying template metakernel

imap_processing/hi/l1b/hi_l1b.py
- Added function for computing direct event latitude and longitude
- Updated the annotate_direct_events function to call the new function
imap_processing/tests/hi/test_hi_l1b.py
- Added test coverage for compute_hae_coordinates function
imap_processing/tests/conftest.py
- Added auto adding of use_test_metakernel fixture to any test marked with @pytest.mark.use_test_metakernel("some_template_kernel.template")
- Made marker name for specifying metakernel template consistent with fixture name
imap_processing/tests/spice/test_geometry.py
- Updated test using @pytest.mark.metakernel to match change in conftest.py fixture
imap_processing/tests/hi/conftest.py
- Added fixture for locating L1A test data
imap_processing/tests/spice/test_data/imap_ena_sim_metakernel.template
- Added kernels required for calculating geometry
imap_processing/tests/hi/test_hi_l1c.py
- Marked test as skip because the test relied on being able to run L1B processing which now requires SPICE. This test will be updated when I get to L1C processing

imap_processing/tests/hi/test_data/l1a/imap_hi_l1a_45sensor-de_20250415_v000.cdf
- This is an L1A file generated from Nick's simulated ENA data

Closes: #867