Configuration with `pytest.ini` not working

## Bug Report

**Current Behavior**
Configuration in a `pytest.ini` or `pyproject.toml` file does not work.

**Input Code**

`pytest.ini`:

```pytest.ini
[pytest]
addopts = --memray
memray = true
hide_memray_summary = true
```

Or the `pyproject.toml` alternative:

```pyproject.toml
[tools.pytest.ini_options]
addopts = "--memray"
memray = true
hide_memray_summary = true
```

**Expected behavior/code**

With this example configuration, I would expect the memray summary to not show after running `pytest`. Putting in any other configuration option has no effect either. When running `pytest --memray --hide-memray-summary`, or other options, this works as expected.

**Environment**

- Python(s): Python 3.12, other versions not tested

Start by reproducing the issue with the shown pytest.ini and pyproject.toml configurations, then compare their behavior with the equivalent command-line options. The work is done when memray plugin options such as memray and hide_memray_summary are honored from both configuration formats and the relevant behavior is covered by tests.

Written by the indexing model from the issue text.