Add SH machine type

[Ulthran]

Summary

• support SH instrument codes in Illumina parsing
• provide fixture data for SH runs
• cover new machine type in tests
• treat SH as another MiSeq model

Testing

• pytest -q

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https://chatgpt.com/codex/tasks/task_e_687aaf9375888323b870e418a3db04c0

[Copilot]

Pull Request Overview

This PR adds support for SH machine type instruments in the Illumina parsing logic. The SH instrument code is treated as another MiSeq model variant within the existing framework.

• Adds SH instrument code mapping to "Illumina-MiSeq" machine type
• Creates test fixture data for SH runs with proper directory structure and FASTQ content
• Refactors flowcell ID parsing logic to use instrument codes directly instead of machine type strings

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
seqBackupLib/illumina.py	Adds SH to MACHINE_TYPES mapping and refactors flowcell parsing logic
test/conftest.py	Creates sh_dir fixture with sample SH run data
test/test_illumina.py	Maps SH instrument code to sh_dir fixture for testing