Fix powerwall data incompatibility with energy integration

[bdraco]

Breaking change

Powerwall import and export sensors are reported now reported as positive values since any negative values are not compatible with state class total increasing. This is being reverted in #67300

Fixes

2022-02-25 18:35:21 WARNING (Recorder) [homeassistant.components.sensor.recorder] Entity sensor.powerwall_site_export from integration powerwall has state class total_increasing, but its state is negative. Triggered by state -47025.4 with last_updated set to 2022-02-25T18:29:59.999999+00:00. Please create a bug report at https://github.com/home-assistant/core/issues?q=is%3Aopen+is%3Aissue+label%3A%22integration%3A+powerwall%22
2022-02-25 18:35:21 WARNING (Recorder) [homeassistant.components.sensor.recorder] Entity sensor.powerwall_site_import from integration powerwall has state class total_increasing, but its state is negative. Triggered by state -33046.6 with last_updated set to 2022-02-25T18:29:59.999999+00:00. Please create a bug report at https://github.com/home-assistant/core/issues?q=is%3Aopen+is%3Aissue+label%3A%22integration%3A+powerwall%22

When a value of 0 is reported, we now reject the data by reporting the state as unavailable. These are likely read failures.

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)
• 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 Powerwall has a transient error in data reporting that results in total energy being reported as 0 #67237 Fixes sensor.powerwall_load_import has state class total_increasing, but its state is not strictly increasing #67244 Fixes Powerwall Integration: Error Message Received Requesting Issue to be logged.  #63909
• This PR is related to issue:
• Link to documentation pull request:

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Fixes #67237

[probot-home-assistant]

Hey there @jrester, mind taking a look at this pull request as it has been labeled with an integration (powerwall) you are listed as a code owner for? Thanks!
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