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Safely remove html output dir setting and improve HTML output docs (p…

…hpbench#930)

* Improved documentation for HTML output

* Safely remove dead setting

* Sanitise cwd references in snapshot test

* Updated docs and schema

* Add html example

* Update CL

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Fix/duplicate permutation runs when using abstract benchmarks (phpben…

…ch#919)

* Prevent registering `#[ParamProviders(...)]` multiple times when benchmark methods are inherited

In a test setup like following, PHPBench would run tests for one subject 4 times:

```php
abstract class MyGenericBench
{
    #[ParamProviders(['provideData'])]
    final public function benchSomething(): void { /* ... */ }
    abstract public function provideData(): array;
}

final class ConcreteBench extends MyGenericBench
{
    public function provideData(): array
    {
        return ['foo' => 1, 'bar' => 2];
    }
}
```

The executed tests datasets would look like following:

```
 * `foo` + `bar`
 * `bar` + `foo`
 * `foo` + `bar`
 * `bar` + `foo`
```

The reason for that is that the `AttributeDriver` processes subject metadata for
each class and for each method, and that happens multiple times in a hierarchy (because
inherited methods appear at each level of the hierarchy).

For example, a 3 level hierarchy would create 16 useless data provider permutations,
with the scenario above.

This patch fixes that by:

 * scanning benchmarks leaf-first (child classes being considered "concrete" benchmarks)
 * ignoring any duplicate subjects: if a subject has been found in a lower level of the inheritance, it is authoritative

* Subsitute sorted with ordered and fix CS

* Skip tests if PHP < 8

* Updated changelog

Co-authored-by: Marco Pivetta <ocramius@gmail.com>

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