Core API work

[codingbandit]

Core API work

Details on the issue fix or feature implementation

• Removes Chat summarization logic from Core API
• Fixes incoming message persistence issue, user prompt is persisted when received and is updated once a completion is received (with the token count and vector)
• Added the /instances/{{instanceId}} routing to the Core API controllers.
• Updated User Portal calls to Core API using the new routes

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have included inline docs for my changes, where applicable
• I have successfully run a local build
• I have provided the required update scripts, where applicable
• I have updated relevant docs, where applicable

[codingbandit]

GitHub timeline issues, will have a new PR