Apply str_contains to replace the strpos usage

[peter279k]

Q	A
Branch	v2.x
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	no
Documented?	no
Fixed tickets	comma-separated list of tickets fixed by the PR, if any

Apply using the str_contains function to replace the strpos function usage.

New Task Checklist:

• [x] Are the dependencies added to the composer.json suggestions?
• [x] Is the doc/tasks.md file updated?
• [x] Are the task parameters documented?
• [x] Is the task registered in the tasks.yml file?
• [x] Does the task contains phpunit tests?
• [x] Is the configuration having logical allowed types?
• [x] Does the task run in the correct context?
• [x] Is the run() method readable?
• [x] Is the run() method using the configuration correctly?
• [x] Are all CI services returning green?

[veewee]

Thanks