[StuartFerguson]

Summary

• Keep the existing Subscription Service summary row in the HTML/email report.
• Add a per-subscription table with status, running state, health, parked count, and operational/runtime reasons.
• HTML-encode subscription values and add regression coverage.

Closes #814

Verification

• Full Pester suite: 47 passed, 0 failed.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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