Issue 432: Expand Issue 405 to cover observable:Software

[ajnelson-nist]

This Pull Request resolves all requirements of Issue #432 .

This Pull Request supersedes PR 447.

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 UCO current unstable branch (020ce56)
• [x] CI passes in CASE current unstable branch tracking UCO's unstable as submodule (d40e99e)
• [x] Impact on SHACL validation reviewed for CASE-Examples
• [x] Impact on SHACL validation remediated for CASE-Examples
• [x] Impact on SHACL validation reviewed for casework.github.io
• [x] Impact on SHACL validation remediated for casework.github.io
• [x] Milestone linked
• [x] Solutions Approval vote logged on corresponding Issue (once logged, can be taken out of Draft PR status)

[ajnelson-nist]

@b0bkaT , once CI passes, please review and merge.