docs(governance): add WebVH witness governance under Service Governance

[PatStLouis]

Summary

Adds the WebVH Witness Governance document to the DITP repo under Governance → Service Governance, including roles, allow list policy, approval process, and offboarding. References to the onboarding roadmap and Aries Endorser alert workflow point to DITP-DevOps.

Resolves

• Fixes DITP-DevOps #277 — Review witness governance for WebVH issuers

Note

A related PR was opened in DITP-DevOps; we were asked to open this PR in DITP so the canonical governance doc lives in the DITP repository.
bcgov/DITP-DevOps#296

[PatStLouis]

@esune there's some tests failing which are unrelated to this PR

[esune]

Looks great, thanks @PatStLouis

I keep going back and forth about having also the onboarding guide published as part of DevHub, but that can be a separate task if/when needed.

@krobinsonca if you can give this a pass from a governance perspective it would be appreciated. Additionally, I know the repo is named DITP, but am wondering if we need to use CDT as acronym in the documents?

[PatStLouis]

@esune the onboarding doc is a reference for teams who want to eventually migrate towards webvh. A sort of pre requisite checklist with a clear definition of what they would have to do with an estimated timeline. It also defines what the CDT team can do for supporting this transition.

Given this, I can also move that PR into the DITP repo instead of DITP-DevOps