Test: fix and add missing Positron extension tests to CI

[testlabauto]

System details:

Positron and OS details:

N/A

Interpreter details:

N/A

Describe the issue:

The following Positron extension tests don't run in CI:

• positron-notebook-controllers
• positron-run-app
• positron-supervisor

It seems like these tests should either be running or be removed.

Steps to reproduce the issue:

npm run test-extension -- -l positron-notebook-controllers npm run test-extension -- -l positron-run-app npm run test-extension -- -l positron-supervisor

Expected or desired behavior:

Tests in the codebase work and run in CI

Were there any error messages in the UI, Output panel, or Developer Tools console?

N/A

[jmcphers]

Some notes from investigating this:

positron-run-app failures are tracked in https://github.com/posit-dev/positron/issues/5823

positron-supervisor failures seem to be CI specific (they pass locally)

positron-notebook-controller failures do seem to reproduce locally

[seeM]

The positron-notebook-controllers extension is deprecated and will be removed in https://github.com/posit-dev/positron/pull/7788. Those tests are now covered by either unit tests in Positron core or e2e notebook tests.