refactor: Remove deprecated dart code metrics

analysis_options.yaml

@@ -25,35 +25,3 @@ analyzer:
     # needed until crypto packages upgrade
     - lib/src/database/database.g.dart
   plugins:
-    # Show code metrics in IDE
-    # - dart_code_metrics
-
-dart_code_metrics:
-  metrics:
-    cyclomatic-complexity: 20
-    number-of-arguments: 4
-    maximum-nesting-level: 5
-    source-lines-of-code: 50
-    # This is still unstable, so handle with care
-    maintainability-index: 40
-  metrics-exclude:
-    - test/**
-  rules:
-    #- newline-before-return
-    - no-boolean-literal-compare
-    - no-empty-block
-    #- prefer-trailing-comma
-    - prefer-conditional-expressions
-    - no-equal-arguments
-    - no-equal-then-else
-    - no-magic-number:
-        severity: style # too noisy otherwise atm
-    - avoid-late-keyword:
-        severity: style # too noisy otherwise atm
-    - avoid-non-null-assertion:
-        severity: style # too noisy otherwise atm
-    - avoid-unused-parameters
-    - binary-expression-operand-order
-  anti-patterns:
-    - long-method
-    - long-parameter-list

pubspec.yaml

@@ -33,7 +33,6 @@ dependencies:
 
 dev_dependencies:
   coverage: ">=0.15.0 <2.0.0"
-  dart_code_metrics: ^4.10.1
   file: ^6.1.1
   import_sorter: ^4.6.0
   lints: ^2.0.0