Adhere to DCM 1.34 and 1.35

[tenhobi]

No description provided.

[github-actions]

DCM report

✅ no issues found!

Full report: https://github.com/netglade/flutter_core/runs/59767331308

[Copilot]

Pull request overview

This PR updates DCM (Dart Code Metrics) from version 1.33.0 to 1.35.0, incorporating new lint rules and updating test files to comply with the new linting requirements, particularly the prefer-test-structure rule which enforces the Arrange-Act-Assert (AAA) pattern.

• Updates DCM version to 1.35.0 and adds 4 new lint rules
• Modifies maintainability-index metric from 50 to 0.5 to align with DCM's updated configuration format
• Restructures test files to follow the AAA pattern with explicit comment sections

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
dcm_global.yaml	Updates DCM version from 1.33.0 to 1.35.0
packages/netglade_analysis/pubspec.yaml	Bumps package version to 21.0.0
packages/netglade_analysis/lib/dcm.yaml	Adds 4 new lint rules and updates maintainability-index metric to 0.5
packages/netglade_analysis/CHANGELOG.md	Documents changes for version 21.0.0
packages/netglade_analysis/README.md	Updates version reference to 21.0.0
packages/netglade_utils/pubspec.yaml	Updates netglade_analysis dependency to ^21.0.0
packages/netglade_utils/example/pubspec.yaml	Updates netglade_analysis dependency to ^21.0.0
packages/netglade_flutter_utils/pubspec.yaml	Updates netglade_analysis dependency to ^21.0.0
packages/netglade_flutter_utils/example/pubspec.yaml	Updates netglade_analysis dependency to ^21.0.0
packages/netglade_utils/test/src/extensions/string_extensions_test.dart	Restructures tests to follow AAA pattern with explicit comments
packages/netglade_utils/test/src/extensions/date_time_extensions_test.dart	Restructures tests to follow AAA pattern and converts forEach to for-in loops

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