Fix last_reported_timestamp not being updated when last_reported is changed

[bdraco]

Proposed change

When a state is created, last_update is always the same as last_reported, and we only update it later if it changes so we can pre-set the cached property to avoid it being run when the recorder accesses it later.

There was a bug here where if last_reported_timestamp had been called, and than last_reported was updated, last_reported_timestamp would report the cached value. This has been fixed.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[bdraco]

This was actually a bug, but it went unnoticed before because it worked the first time

[bdraco]

@coderabbitai review

[coderabbitai]

Walkthrough

The recent changes in the Home Assistant core involve refining timestamp management within the Core class. Specifically, the __init__ and async_set methods were updated to handle last_updated_timestamp, last_changed_timestamp, and last_reported_timestamp more accurately. Additionally, a new test function was introduced to ensure the async_set method correctly updates the last_reported and last_reported_timestamp properties.

Changes

File Path	Change Summary
homeassistant/core.py	Updated __init__ and async_set methods to refine timestamp handling.
tests/test_core.py	Added test_async_set_updates_last_reported to verify timestamp updates.

Sequence Diagram(s) (Beta)

sequenceDiagram
    participant User
    participant HomeAssistant as Home Assistant
    participant Core

    User->>HomeAssistant: Initialize Core
    HomeAssistant->>Core: __init__ method
    Core-->>HomeAssistant: Set initial timestamps

    User->>HomeAssistant: Update state
    HomeAssistant->>Core: async_set method
    Core-->>HomeAssistant: Update last_reported and last_reported_timestamp

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[bdraco]

Something is broken at github today. It keeps showing that I cancelled the test runs but I haven't

[bdraco]

And github just started over again running the PR....

[bdraco]

doing another run in #118348 to verify this is a github issue