INT-3299: Fixed id prop logging a warning when it shouldn't

[danoaky-tiny]

Ticket: INT-3299

Changes:

• Added an extra check for duplicate editor IDs. As well as checking if a current element exists with that ID, it checks that this element is not equal to the elementRef in the EditorComponent. If it is, it logs a warning as before.
• Added PropTest.ts to test: that one editor instance with an ID does not log a warning, multiple editors with the same ID does log a warning and multiple editors with different IDs does not log a warning.
• Added a captureLogs function.
• Added chai and edited the eslint config to support it.

Relevant Github Issue: #374