Create reusable workflow_call templates for module CI/CD

[lipkau]

Problem

Complex CI/release workflow logic is duplicated across AtlassianPS module repositories, which causes drift and makes cross-repo hardening slow and error-prone.

Proposal

Create reusable workflow_call templates in AtlassianPS.Standards for module CI, release, and policy checks. Keep repo-local wrappers thin and repository-specific.

Acceptance criteria

• AtlassianPS.Standards ships reusable workflows for CI and release with documented inputs/outputs.
• JiraPS is migrated as the pilot consumer using thin wrapper workflows.
• A policy check exists that flags deprecated action references and mutable @master action pins.
• Migration guidance documents how remaining repos adopt the reusable workflows incrementally.