General Indices: Diag Manager Test

[abrooks1085]

Description
Adds test coverage for generalized axis permutations in the diag_manager.

Recent support for generalized indices requires validation that axis metadata (dimension ordering) and data layout remain consistent through send_data and I/O. These tests validate that axis registration (metadata) and data permutation remain consistent with canonical data through the write/read path.

The tests use structured data encoding to reliably detect index/order mismatches and exercise multiple permutations, including swaps and cyclic permutations (e.g., YX, ZYX, YZX, ZXY). Tests are performed in a local (non-decomposed) configuration, isolating permutation correctness from domain decomposition and masking effects.

How Has This Been Tested?
amdbox + intel + autotools

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes

[uramirez8707]

@abrooks1085, can you check if removing the "contiguous" keyword out of diag_send_data resolves the CI failures.
uramirez8707@295ef82