[Draft] Enable psycopg v3 tests

[kwongtn]

Description

Merge the following first:

• https://github.com/strawberry-graphql/strawberry-django/pull/683
• https://github.com/strawberry-graphql/strawberry-django/pull/684

P.s. Not sure if putting like 50 test scenarios is a good idea though 😅

Also I was thinking -- are we even using postgres in tests? 🤔

Types of Changes

• [ ] Core
• [ ] Bugfix
• [ ] New feature
• [x] Enhancement/optimization
• [ ] Documentation

Checklist

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] I have tested the changes and verified that they work and don't break anything (as well as I can manage).

Summary by Sourcery

Tests:

• Add tests for psycopg v3 compatibility.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This PR enables tests for psycopg v3, expands Django and Python version support, and migrates from django-mptt to django-tree-queries.

Class diagram showing tree structure migration

classDiagram
    note for TreeNode "Replaces MPTT implementation"
    class TreeNode {
        +parent: TreeNode
        +children: List[TreeNode]
        +depth: int
        +path: str
    }
    TreeNode --> TreeNode: parent
    note for ArrayField "Now supports both psycopg2 and psycopg3"
    class ArrayField {
        +base_field
        +size: Optional[int]
        +default: Any
    }

File-Level Changes

Change	Details	Files
Enable psycopg v3 tests	Added "psycopg" to the test matrix, enabling tests with psycopg v3. Added installation steps for both psycopg and psycopg-binary packages within the test workflow.	.github/workflows/tests.yml
Expand Django and Python version support	Added Django 5.1 to the test matrix. Included Python 3.8 and Django 4.2 combination in the test matrix. Adjusted exclusions to reflect the supported Python versions for each Django version (e.g., Django 4.2 with Python 3.13, Django 5.0 with Python 3.9 and 3.13, Django 5.1 with Python 3.9).	.github/workflows/tests.yml
Migrate from django-mptt to django-tree-queries	Replaced django-mptt with django-tree-queries in pyproject.toml. Updated imports and model definitions to use django-tree-queries instead of django-mptt. Renamed MPTT-related classes and files to TreeNode. Updated tests to reflect the changes in models and imports. Created new TreeNode-related files and tests. Removed MPTT-related files and tests.	pyproject.toml tests/relay/mptt/test_nested_children.py tests/relay/treenode/test_nested_children.py tests/relay/mptt/models.py tests/relay/treenode/models.py tests/relay/mptt/test_lazy_annotations.py tests/relay/treenode/test_lazy_annotations.py tests/relay/treenode/b.py tests/relay/treenode/a.py tests/relay/mptt/a.py tests/relay/mptt/b.py

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.17%. Comparing base (48b54fd) to head (d13d70c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #685   +/-   ##
=======================================
  Coverage   89.17%   89.17%           
=======================================
  Files          41       41           
  Lines        3778     3778           
=======================================
  Hits         3369     3369           
  Misses        409      409           

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[bellini666]

@kwongtn now you can rebase this 😊

[bellini666]

@kwongtn are you still going to work on this?