Assistant: disable tools in invalid contexts

[sharon-wang]

Summary

• addresses Assistant: Don't provide tools to models in invalid contexts #8078
• inspectVariables: now filtered out when no variables in session
• getPlot: now filtered out if no session or no current plot
• getTableSummary: now filtered out if no session and no variables in session
• projectTreeTool: filtering already covered in assistant: add documentCreate tool for Agent mode #8264

Release Notes

New Features

• Assistant: tools are now disabled if the context doesn't include the info needed for the tool (Assistant: Don't provide tools to models in invalid contexts #8078)

QA Notes

@:assistant

test cases

tool	enabled when	disabled when
inspectVariables	session(s) exist and at least 1 variable is defined	no sessions; or sessions exist but no variables defined
getPlot	session(s) exist and there is a plot currently visible	no sessions; or sessions exist but no plot visible
getTableSummary	for now, only when Python session(s) exist (this tool is not yet implemented for R #8343) and at least 1 variable is defined	for now, if no sessions or if only R sessions exist; or Python sessions exist but no variables defined

how to check

• try to invoke the disabled tool via chat and notice that the tool cannot be called; or
• check the Output pane for Assistant with log level Debug or Trace for the message with [tools] Available tools for participant
  • if the tool is not in the list, it is disabled/filtered out

[github-actions]

E2E Tests 🚀
This PR will run tests tagged with: @:critical @:assistant

^{readme  valid tags}

[jmcphers]

LGTM

[sharon-wang]

• rebased on main to hopefully fix the bootstrap extension e2e test error
• add small change to require variables for the data summary tool

will merge once green 🟢