Issue 431: Remove core:id

[ajnelson-nist]

This Pull Request resolves all requirements of Issue #431 .

Coordination

• [x] Pull request is against correct branch
• [x] Pull Request is in, or reverted to, Draft status before Solutions Approval vote has passed.
• [x] CI passes in (CASE/UCO) feature branch
• [x] CI passes in (CASE/UCO) current unstable branch (56d0976)
• [x] CI passes in CASE current unstable branch tracking UCO's unstable as submodule (2058e66) (This is not the adopting commit, but 193004b is in the history of the adopted UCO unstable state)
• [x] Impact on SHACL validation reviewed for CASE-Examples
• [x] Impact on SHACL validation remediated for CASE-Examples (N/A)
• [x] Impact on SHACL validation reviewed for casework.github.io
• [x] Impact on SHACL validation remediated for casework.github.io (N/A)
• [x] Solutions Approval vote logged on corresponding Issue (once logged, can be taken out of Draft PR status)

[ajnelson-nist]

Converting to Draft until Solutions Approval vote is logged.

[ajnelson-nist]

Follow-on patch coming to address merge conflict.

[ajnelson-nist]

@plbt5 , @eoghanscasey , @b0bkaT - once CI finishes, this PR is ready for review and merge. The first to review may merge.