Remove all XXXContaining matchers for v9

[christian-bromann]

With #1356 we started to support asymmetric matchers e.g. expect(browser).toHaveTitle(expect.stringContaining('foobar')). With that the additional XXXContaining became redundant and I would prefer to remove them to keep the API interface assessable.

This is a v9 task and pull requests should be raised against the v9 branch. Join the 🙏-contribute channel on Discord if you are interested to join us in this effort.