refs #9178
* Add eslint deps, remove old lint deps
* Add eslint config, remove old lint configs
* Config for server and tests are different
* Tweaked rules to suit us
* Fix linting in codebase - lots of indent changes.
* Fix a real broken test
no issue
- add caching logic to adapter creation (same as we use for storages)
- add debug logs to the default scheduler
- add `requestTimeout` to the default scheduler to support custom timeouts
- add `isRunning` logic to protect running the scheduler twice
closes#8568
- use our `urlJoin` util to concatenate the URL (not the query part of it, as this is not supported in `urlJoin`) and to prevent possible missing or double slashes, as `config.apiUrl` could be with or without trailing slash
