fix(poll-job-state): fixed checking session state

[YuryShkoda]

Issue

Parent session may be in a not healthy state (running or idle) while checking SAS job state.

Intent

• Add idle as a healthy parent session state.

Implementation

• Added isSessionStatesHealthy utility to src/api/viya/pollJobState.ts.
• Adjusted unit tests covering doPoll function.

Checks

No PR (that involves a non-trivial code change) should be merged, unless all items below are confirmed! If an urgent fix is needed - use a tar file.

• Unit tests coverage has been increased and a new threshold is set.
• All sasjs-cli unit tests are passing (npm test).
• (CI Runs this) All sasjs-tests are passing. If you want to run it manually (instructions available here).
• Data Controller builds and is functional on both SAS 9 and Viya