Show uptime as readable text

[bharvey88]

Version: 26.9.29.1

What does this implement/fix?

Replaces the numeric Uptime sensor with ESPHome's built-in uptime text sensor, so Home Assistant shows uptime as 3d 4h 12m instead of a raw count of seconds. Thanks to @kernelpanic85 for the idea in ApolloAutomation/R_PRO-1#72.

• Uptime is now a text entity. Its history graph and long-term statistics stop, and any automation or template that treats uptime as a number needs updating.
• Home Assistant sees it as a new entity. The old numeric Uptime entity will show as unavailable and can be deleted.
• The ID stays sys_uptime, so component.update: sys_uptime in the report scripts still works.
• At the 60s update interval ESPHome leaves seconds off, so uptime under a minute reads 0m. Battery devices that sleep right after reporting will usually show 0m.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

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