feat: enable Task Disablement via Environment Variables

[feat] Enable Task Disablement via Environment Variables

What?

Implement the ability to disable individual Taskfile tasks through environment variables (e.g., COMMITLINT=false to disable the commitlint task).

Why?

Enhance system flexibility and configurability by allowing developers to easily disable specific tasks according to their requirements, without modifying configuration files.

How to reproduce?

Feature: Task Disablement via Environment Variables
  As a developer
  I want to disable specific tasks using environment variables
  In order to have more flexibility in task execution

  Scenario: Disabling a specific task
    Given a project configured with all tasks enabled
    When I set the environment variable "COMMITLINT=false"
    Then the commitlint task should not execute
    And all other tasks should continue to function normally

  Scenario: Re-enabling a previously disabled task
    Given a task disabled via "COMMITLINT=false"
    When I remove the environment variable
    Then the commitlint task should execute normally again

Definition of Done

Implementation of environment variable detection for each task
Documentation updated with the list of available variables
Tests added to verify task disablement/re-enablement
All Taskfiles support disablement via their respective variables
README updated with new configuration options

Breaking change? ⚠️ No

Additional Information: List of affected tasks:

BUN
COMMITIZEN
COMMITLINT
DEV
DOCKER
LIZARD
MEGALINTER
NODEJS
YAMLLINT