ci(scripts): add reusable Pester testing workflow and PR validation integration #288

Job	Run time
npm Security Audit	12s
Spell Check / Spell Check	10s
PowerShell Tests / PowerShell Tests	17s
Markdown Lint / Markdown Lint	13s
Table Format Check / Table Format Check	12s
PowerShell Lint / PowerShell Lint	12s
Link Language Check / Check for Language Paths in URLs	13s
Validate Dependency Pinning / Validate SHA Pinning Compliance	24s
Frontmatter Validation / Validate Markdown Frontmatter	9s
CodeQL Security Analysis / CodeQL Analysis (actions)	58s
Markdown Link Check / Check Markdown Links	1m 15s
	4m 15s

Provide feedback