Refactor Shelly number platform to use upstream set_thermostat_state

[thecode]

Proposed change

SSIA

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[home-assistant]

Hey there @bieniu, @chemelli74, @bdraco, mind taking a look at this pull request as it has been labeled with an integration (shelly) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

This PR refactors the Shelly number platform to use the upstream library's set_thermostat_state method instead of making direct HTTP requests. This simplifies the code by leveraging functionality already provided by the aioshelly library.

Key changes:

• Replaced direct HTTP requests (http_request) with the upstream library's set_thermostat_state method
• Removed now-unnecessary rest_path and rest_arg fields from BlockNumberDescription dataclass
• Simplified async_set_native_value method by removing the _set_state_full_path helper function

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
homeassistant/components/shelly/number.py	Refactored to use upstream set_thermostat_state method, removed HTTP request-related fields from description class, simplified error handling flow
tests/components/shelly/test_number.py	Updated test assertions and mocks to verify calls to set_thermostat_state instead of http_request

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[bieniu]

Looks good 👍

[thecode]

Thanks @bieniu @chemelli74 👍