feat(scripts): add 46 workshop screenshots and fix capture script (#3)

* Add new images for lab 07 OIDC setup and scan workflow

- Added lab-07-oidc-setup.png (3948 KB) to illustrate the OIDC setup process.
- Added lab-07-scan-workflow.png (1389 KB) to demonstrate the scan workflow.

* feat: update screenshot capture logic and add new images for lab 02 PSRule scans

* feat: add new screenshots for labs 00, 01, and 04, and update screenshot capture logic in capture-screenshots.ps1

* feat: add Phase 3 post-scan screenshots for labs 06-07 AB#2132

- add 4 lab-06 screenshots: gh-api-upload, security-tab, alert-detail, alert-triage
- add 5 lab-07 screenshots: workflow-run, matrix-jobs, sarif-artifacts, cost-gate-pr, deploy-teardown

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Author: emmanuelknafo