Reorganize tests

[ChenZhao44]

No description provided.

[Copilot]

Pull Request Overview

This PR reorganizes the test suite structure by introducing module-based subdirectories, standardizing code formatting, and updating CI configuration.

Key Changes

• Test files reorganized into module-specific subdirectories (ZX, Utils, ZXW, PMG, ZW, Application)
• Whitespace cleanup: removed trailing blank lines and unnecessary line breaks
• Julia syntax modernization: replaced deprecated = with in in for loops and comprehensions
• Removed nightly Julia version from CI workflow

Reviewed Changes

Copilot reviewed 17 out of 24 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/runtests.jl	Updated test organization with module-based testset hierarchy and new file paths
test/ZXW/zxw_rules.jl	Removed blank lines and reformatted multi-line assignments
test/ZXW/zxw_diagram.jl	Cleaned up whitespace and changed loop syntax from = to in
test/ZXW/utils.jl	Removed blank lines, fixed trailing commas, adjusted spacing in slicing expressions
test/ZX/zx_graph.jl	Changed loop syntax from = to in and removed blank line
test/ZX/zx_diagram.jl	Changed loop comprehension syntax from ∈ to in
test/ZX/rules.jl	Changed loop syntax from = to in and removed trailing commas
test/ZX/plots.jl	Removed blank line
test/ZX/ir.jl	Cleaned up whitespace, reformatted multi-line assignments, changed loop syntax
test/ZX/challenge.jl	Changed loop syntax from = to in and removed trailing commas
test/ZX/abstract_zx_diagram.jl	Removed blank line
test/ZW/zw_utils.jl	Removed blank lines, fixed trailing commas, adjusted spacing
test/ZW/zw_diagram.jl	Removed blank lines and trailing commas
test/Utils/parameter.jl	Removed blank lines
test/PMG/planar_multigraph.jl	Removed blank lines and trailing commas throughout
test/Application/to_eincode.jl	Reformatted multi-line array literal to single line
.github/workflows/CI.yml	Removed nightly Julia version from test matrix

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