Failing tests due to urlencode

Code style fix.

The tests in facets module all use Url::fromUserInput() to test facet urls.
So I am doing the same here, but with a helper method for convenience.

One thing I am not sure about is IntegrationTest::assertCurrentUrl().

  protected function assertCurrentUrl(string $expected_url): void {
    // Check first the path & the fragment.
    $this->assertSession()->addressEquals($expected_url);
    // Compare also the query strings as arrays but allow different order.
    $expected_query = $this->normalizeQueryString($expected_url);
    $actual_query = $this->normalizeQueryString($this->getSession()->getCurrentUrl());
    $this->assertEquals($expected_query, $actual_query);
  }

For some reason there is no complaining about url-encoded square brackets here.

Also the part after $this->assertSession()->addressEquals($expected_url); seems weird: If query parts are in different order, wouldn't this already cause the previous assertion to fail?

So the actual problem was this: #3164686: WebAssert::addressEquals() and AssertLegacyTrait::assertUrl() fail to check the querystring

With Drupal 9.2.*, the tests would pass because the query string was ignored in the assertions.

With Drupal 9.3.*, the tests fail because of urlencode, and because some of them actually had wrong expectations.