SAS9 mocker improved - public access denied scenario

[medjedovicm]

Issue

@sasjs/adapter#150

Intent

• Improved an added sas9 mocking endpoints
• Storing the username (using public will reproduce the Public Access Denied scenario)

Checks

• [x] Code is formatted correctly (npm run lint:fix).
• [x] Any new functionality has been unit tested.
• [x] All unit tests are passing (npm test).
• [] All CI checks are green.
• [x] Reviewer is assigned.

[sasjsbot]

:tada: This PR is included in version 0.21.0 :tada:

The release is available on:

• GitHub release
• v0.21.0

Your semantic-release bot :package::rocket: