Issue 493: Trigger CI on all branches starting with "develop" and "unstable"

[ajnelson-nist]

This Pull Request is part of resolving Issue #493 .

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 UCO feature branch
• [x] CI passes in UCO current unstable branch (c737028)
• [x] CI passes in CASE current unstable branch tracking UCO's unstable as submodule (1994f18)
• [x] Impact on SHACL validation reviewed for CASE-Examples (skipped)
• [x] Impact on SHACL validation remediated for CASE-Examples (skipped)
• [x] Impact on SHACL validation reviewed for casework.github.io (skipped)
• [x] Impact on SHACL validation remediated for casework.github.io (skipped)
• [x] Milestone linked
• [x] Solutions Approval vote logged on corresponding Issue (once logged, can be taken out of Draft PR status)