Update CI template tests for Assay workbook

[Gonza10V]

Motivation

• CI template tests targeted the removed Study.xlsm workbook; update the tests to point at the new Assay.xlsm template and align expectations with the workbook's current sheets and welcome handling.

Description

• Replace Study.xlsm with Assay.xlsm in TEMPLATE_SHEETS and require the Assay workbook to include assay, sample, measurement, and signal sheets in tests/test_templates.py.
• Update CONVERTIBLE_TEMPLATES to attempt SBOL conversion for Assay.xlsm instead of Study.xlsm.
• Modify the welcome metadata assertion so the test only requires welcome metadata when the Init configuration explicitly lists a welcome sheet.

Testing

• Ran python -m pytest -q tests/test_templates.py which passed (16 passed, 9 warnings).
• Ran python -m compileall -q src tests which succeeded.
• Ran python -m pip check, which reported an informational packaging version conflict due to packaging==21.3 pinned by test deps while an existing black installation requires packaging>=22.0.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore welcome-sheet coverage

For the distributed templates that contain a welcome worksheet but do not list it in the Init table, this condition is false, so the test no longer asserts anything about welcome metadata. In that scenario initialise_welcome() can keep returning None, and converter() will skip setting SBOL_DICTIONARY, losing welcome fields such as Domain/Name/Master Collection without CI catching it. Please key the assertion off workbook sheet presence, or add welcome to Init, rather than using init_info as the gate.

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