Make atlantisbot a hybrid command + add rough testing setup for commands

[johnvictorfs]

Motivation

• Provide an automated check that the AtlantisBot help command is exposed as a Discord application (slash) hybrid command after the previous change converting it from a plain prefix command to a hybrid command.

Description

• Add tests/test_atlantisbot_command.py which stubs run-time dependencies and imports bot.cogs.chat.Chat to verify the command registration.
• The test stubs bot.bot_client, bot.utils.checks, bot.utils.context, and bot.cogs.raids to avoid requiring Django and other external services during import.
• The test asserts that Chat.atlantisbot is a commands.HybridCommand, that its name is "atlantisbot", and that the alias "atlbot" is present.

Testing

• Ran pytest -q and the new test passed (1 passed).

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Codex Task

[Copilot]

Pull request overview

This PR converts the atlantisbot command from a prefix-only command to a hybrid command (supporting both prefix and slash command invocation) and establishes a testing framework to verify command registration and behavior.

Changes:

• Converted atlcommands function to atlantisbot as a HybridCommand with multiple aliases
• Added pytest dependency and test infrastructure with module stubbing
• Added GitHub Actions workflow step to run tests

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
bot/cogs/chat.py	Converted atlcommands command to atlantisbot hybrid command with updated aliases
tests/helpers.py	Created test helper utilities including module stubs and fake context for isolated testing
tests/test_atlantisbot_command.py	Added test to verify atlantisbot is registered as a hybrid command with correct name and aliases
tests/test_aplicar_aod_command.py	Added test for aplicar_aod command message behavior
tests/init.py	Created test package initialization file
pyproject.toml	Added pytest as a development dependency
.github/workflows/ci.yml	Updated cache action version, added system dependencies, and added pytest execution step
bot/bot_client.py	Added command tree synchronization on bot startup
bot/cogs/amigosecreto.py	Reformatted long strings for better readability (unrelated to main PR purpose)

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