refactor: modularize CI workflows by replacing legacy scripts with a centralized QA pipeline and dedicated utility actions

[ShahrearMSf]

Modularize CI workflows by replacing legacy scripts with a centralized QA pipeline and dedicated utility actions. Introduce comprehensive GitHub Actions workflows for continuous integration and quality assurance; including build, compatibility tests across WP/PHP versions, and various code checks. These checks include:

1. PHP Linting/Syntax Check in multiple PHP versions (✅ Passing Successfully)
2. Plugin Version Check (✅ Passing Successfully)
3. Different WP/PHP cross version compatibility tests (✅ Passing Successfully)
4. PCP Plugin Check (❌ These will keep failing until all the issues are fixed, can be ignored for now)

[ShahrearMSf]

As the PR has been reviewed and approved, I'm merging it. Thanks @HurayraIIT bhai for reviewing.