Remove str_ends_with(), str_starts_with(), str_contains() rules, now handled in PHP 8.0 natively

[TomasVotruba]

There are native PHP features that handle such situations much in native way, e.g.

• https://github.com/rectorphp/rector/blob/main/docs/rector_rules_overview.md#strstartswithrector
• https://github.com/rectorphp/rector/blob/main/docs/rector_rules_overview.md#strendswithrector

This will improve the overall experience as well https://ben.balter.com/2016/07/21/removing-a-feature-is-a-feature/ :slightly_smiling_face: