Refactor : replace BGL_FORALL_* macro with range-based in mcgregor_common_subgraphs.hpp

[NNhanptnk]

Before submitting

• This PR targets the develop branch.
• I searched for an existing PR or issue covering the same change.
• My contribution is licensed under the Boost Software License 1.0.

Type of change

• Bug fix
• New feature or API addition
• Refactor (no behavior change)
• Documentation
• Build, CI, or tooling
• Other (specify below)

Does this PR introduce a breaking change?

• Yes (describe migration impact below)
• No

What this PR does

Like title, this PR is used to replace BGL_FORALL_* macro with range-based in a specific public header mcgregor_common_subgraphs.hpp

Motivation

Refactor pre-C++11 macro with range-based for loop.
This refactor only affects header : include/boost/graph/mcgregor_common_subgraphs.hpp
From #593

Testing

Checklist

• Existing tests pass (b2 in the test/ directory).
• New behavior is covered by a test, or this is a docs / build / refactor change.
• Documentation was updated if user-facing behavior changed.
• No new compiler warnings on the platforms I built against.

[github-actions]

Boost dependency footprint vs develop (auto-generated).
PR run 36810977675 vs develop run 36743694638 (ef5d845696).

Header-inclusion weights (graph files pulling each direct dependency in):

Dependency	develop	PR	Δ
range	7	8	+1

Transitive Boost modules: 47 → 47 (0)

[github-actions]

Compiler-warning counts vs develop (auto-generated).
PR run 36810977601 vs develop run 36743694380 (ef5d845696).

Job	Baseline	After	Delta
macos (clang, 14)	392	392	0
macos (clang, 17)	391	391	0
macos (clang, 20)	391	391	0
ubuntu (clang-19, 14)	392	392	0
ubuntu (clang-19, 17)	391	391	0
ubuntu (clang-19, 20)	391	391	0
ubuntu (clang-19, 23)	391	391	0
ubuntu (gcc-14, 14)	345	345	0
ubuntu (gcc-14, 17)	341	341	0
ubuntu (gcc-14, 20)	341	341	0
ubuntu (gcc-14, 23)	341	341	0
windows_msvc_14_3 (msvc-14.3)	931	931	0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Becheler]

@NNhanptnk thank you! 🥳