Add deprecation notices for Node Tests, PHP workflows, and Deploy workflow

[Copilot]

This PR adds deprecation notices to guide users toward the new standalone GitHub Actions for testing Node.js and PHP projects, as well as deploying to remote repositories.

Changes Made

Node Tests Workflow

• Added deprecation notice pointing users to @alleyinteractive/action-test-node

PHP Workflows

• PHP Tests with MySQL: Added new deprecation notice pointing to @alleyinteractive/action-test-php
• PHP Code Quality: Updated existing deprecation notice to point to @alleyinteractive/action-test-php instead of the PHP Composer Script workflow
• PHP Coding Standards: Updated existing deprecation notice to point to @alleyinteractive/action-test-php instead of the PHP Composer Script workflow
• PHP Composer Script: Added deprecation notice pointing to @alleyinteractive/action-test-php

Deploy Workflow

• Deploy to Remote Repository: Added deprecation notice pointing to @alleyinteractive/action-deploy-to-remote-repository

Benefits

These standalone actions provide:

• Better maintainability and focused functionality
• More flexible configuration options
• Easier testing and updates independent of this repository
• Clearer separation of concerns between different workflow types

All deprecation notices follow the existing format used throughout the repository and include direct links to the replacement actions for easy migration.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[srtfisher]

@copilot add a deprecation notice to the PHP Composer Script workflow, too. also, add a deprecation notice to the Deploy to Remote Repository workflow to use https://github.com/alleyinteractive/action-deploy-to-remote-repository.

[Copilot]

@copilot add a deprecation notice to the PHP Composer Script workflow, too. also, add a deprecation notice to the Deploy to Remote Repository workflow to use https://github.com/alleyinteractive/ac...

Added deprecation notices for both workflows as requested:

1. PHP Composer Script workflow - now points to @alleyinteractive/action-test-php
2. Deploy to Remote Repository workflow - now points to @alleyinteractive/action-deploy-to-remote-repository

Both notices follow the same format as the existing deprecation notices in the repository. (3f1c4c8)