Fix cspell, phpcs and phpstan errors

Problem/Motivation

After adding the gitlabCI file proposed in 3489257 ✨ Add CI file to project Needs work , the pipeline shows a few errors that could be fixed in order to be all green

Steps to reproduce

See the pipeline in the related issue

Proposed resolution

Fix the errors

Remaining tasks

MR with the fixes for the code and the cspell

User interface changes

N/A

API changes

N/A

Data model changes

N/A