Add ServiceNow ITSM connect support for ESS IT

[DapheneShao]

Summary

ITSM follow-up stacked on #331. This keeps #331 as the Employee Self-Service (HR) + ServiceNow HRSD baseline and generalizes the same DA ServiceNow workflow through small HRSD/ITSM product profiles.

• adds Employee Self-Service (IT) + ServiceNow ITSM profile support
• lists recognizable live ESS HR/IT agents and lets the maker choose one per /connect servicenow invocation
• passes the selected agent ID directly to the shared workflow without changing .local/config.json.activeAgent
• mutates only the exact Microsoft official topics in the selected product profile
• preserves the existing Connectivity, Entra user-login credential verification, agent-scoped state, publish confirmation, and maker-assisted UI boundaries

Validation

• python -m pytest tests/scripts/test_agentbuilder.py tests/scripts/test_setup_existing_da.py tests/setup/test_da_setup_router.py -k 'servicenow or connect' tests/scripts/test_connect_servicenow_da.py tests/setup/test_servicenow_da_connect_router.py -q — 42 passed
• python -m ruff check solutions/ess-maker-skills/scripts/connect_servicenow_da.py tests/scripts/test_connect_servicenow_da.py tests/setup/test_servicenow_da_connect_router.py — passed
• python solutions/ess-maker-skills/scripts/connect_servicenow_da.py --help — passed
• git diff --check — passed

A broader related test run completed 192 tests and found two unrelated existing prompt-text assertion failures in tests/setup/test_da_setup_router.py; neither touches the ServiceNow connect path.

Agent-discovery fallback fix at head d4de6a35fecd3ca0c158b8ce742725c2fd595892:

• keeps live MinimalBot enumeration as the primary source and directly verifies authoring-ready canonical Dev agents omitted by enumeration
• adds regression coverage for list=[] + canonical IT ready + exact 200, unchanged activeAgent, exact identity mismatch, and exact authorization failure
• focused ServiceNow/router tests — 38 passed
• related AgentBuilder/setup/router/ServiceNow regression selection — 45 passed, 153 deselected
• read-only live list-agents validation — passed; returned Employee Self-Service (IT) as ServiceNow ITSM, status: ready, selectable: true, with no discovery errors

Remaining live validation

The Agent-discovery blocker is fixed and live-validated. The user can now continue with /connect servicenow.

Before this PR is ready, a maker must complete the remaining validation gates against the real Employee Self-Service (IT) agent and ServiceNow ITSM connection:

• run live inspect and review the selected ITSM topics
• prepare the official ITSM topics if the maker confirms the state changes
• create/sign in to the physical entraIDUserLogin credential if needed
• complete Agent Connect in Copilot Studio
• confirm conditional parameter sharing when exposed
• explicitly confirm publish as a separate step
• run the ITSM Test pane prompt and record a passing result

Physical credential creation/sign-in, Agent Connect, conditional parameter sharing, and Test pane validation remain maker-assisted because #331 established no approved API for those actions. This PR remains Draft until the remaining gates pass.

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