test(datetime): un-flake presentation test (#28090)

Issue number: N/A

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## What is the current behavior?
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There are two problems with this test:

1. The screenshots are not capturing the correct UI. For example, the
following screenshot should capture the date and time grid picker, but
it's only capturing the year wheel picker:
https://github.com/ionic-team/ionic-framework/blob/8ab3476ac7e9b05aba5328c31db763011dc0a766/core/src/components/datetime/test/presentation/datetime.e2e.ts-snapshots/datetime-presentation-date-time-diff-ios-rtl-Mobile-Safari-linux.png
2. These screenshots are flaky. This is possibly due to how they were
written where they iterate through an array, select a value from the
`select`, and then wait a timeout for the view to change.
3. I also discovered that we'll have some visual diffs once 2024 hits.
The current value of the datetime on the wheel picker is 2022. 2023 is
shown, but 2024 is not (since we are still in 2023). Once Jan 1 2024
hits, these tests will likely start to fail with visual diffs.

## What is the new behavior?
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this PR. -->

- Refactored these tests to use a test fixture where each presentation
is a separate test. This ensures that the tests are correct. Because
there is less interaction going on with the page (i.e. the correct
presentation is set on load), my hope is that this also reduces test
flakiness.
- Also changed the date used to be several years ago so we don't have
new years showing up in the wheel picker screenshots as time goes on.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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## Other information

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screenshots of how the component looks before and after the change. -->

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Co-authored-by: ionitron <hi@ionicframework.com>