Add Option for Pre-Scan command, fix auth race [IDE-908][IDE-939]

[bastiandoetsch]

Description

• add command that is called before a scan
• refactor: move dependency-less test helpers to package testsupport
• adds a helper target to the Makefile: lint-fix fixes findings the linter can fix
• fixes the following auth race:

A potential race condition related to authentication has been identified in IntelliJ.

1. IDE starts up CLI with initializationOptions incl. OAuth2 token
2. LS starts WHOAMI workflow with (expired) credentials
3. WHOAMI workflow refreshes OAuth2 token
4. LS saves token and triggers $/hasAuthenticated with new token
5. At the same time, IDE sends the current configuration with DidChangeConfiguration, with the old credentials
6. LS updates the credentials to the old credentials
7. Next call to API returns not authenticated and creds are deleted in LS
8. LS forwards the logout to the IDE.

Solution: when updating the token, do not accept super-seded tokens (check Expiry)

Note
The high line change count is due to the license update, which pulled in a few files into the license folder.

Checklist

• Tests added and all succeed
• Linted
• README.md updated, if user-facing
• License file updated, if new 3rd-party dependency is introduced

[acke]

LGTM