Migrate Python Codebase from 3.9 to 3.10

[gitar-bot-staging]

🔧 Standardize Python version and improve code quality across services

Description

This PR implements systematic code quality improvements and Python version standardization across all services in the osparc-simcore platform. The changes include downgrading Python from 3.11.9 to 3.10.14 for broader compatibility, fixing decimal precision issues, updating type annotations, and adding comprehensive testing infrastructure.

Motivation

• Compatibility: Standardize on Python 3.10.14 to ensure broader environment compatibility and more stable deployment across different systems
• Code Quality: Address precision issues with Decimal constructors and modernize type annotation usage
• Testing Infrastructure: Introduce tox.ini for consistent testing across multiple Python versions and environments
• Maintainability: Systematic cleanup following automated refactoring checkpoints to ensure consistency across the codebase

Impact

Services Updated

• api-server, autoscaling, catalog, clusters-keeper, dask-sidecar
• datcore-adapter, director-v2, director, dynamic-scheduler, dynamic-sidecar
• efs-guardian, invitations, migration, notifications, payments
• resource-usage-tracker, storage, web

Key Improvements

• ✅ Enhanced Compatibility: Broader Python version support (>=3.10 vs ~=3.11)
• ✅ Improved Precision: Fixed Decimal constructor usage for accurate financial calculations
• ✅ Modern Type Annotations: Updated deprecated __args__ usage to get_args()
• ✅ Better Testing: Added comprehensive tox configuration for multi-environment testing

Changes Made

📋 Detailed Changes

Python Version & Requirements

• Dockerfiles: Updated PYTHON_VERSION from 3.11.9 → 3.10.14
• setup.py: Changed python_requires from "~=3.11" → ">=3.10"

Code Quality Fixes

• Decimal Constructors:

  # Before
  Decimal(20.0)
  
  # After  
  Decimal("20.0")

• Type Annotations:

  # Before
  InstanceTypeType.__args__
  
  # After
  get_args(InstanceTypeType)

Testing Infrastructure

• New File: Added comprehensive tox.ini configuration supporting:
  • Python 3.10 and 3.11 environments
  • Linting with ruff and pylint
  • Type checking with mypy
  • Code formatting validation
  • Coverage reporting
  • Security scanning

Test Plan

• ✅ All existing tests pass with Python 3.10.14
• ✅ Decimal precision fixes validated in financial calculation tests
• ✅ Type annotation updates verified with mypy
• ✅ Tox configuration tested across multiple environments

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