Revert "shelly_naming" rebase errors

[thecode]

Revert mistakenly included “shelly_naming” function in PR #40429 which was replaced by “get_entity_name”
Fix “get_entity_name” to support REST sensors

Breaking change

Proposed change

This PR reverts to remove a function shelly_naming which was mistakenly included in PR #40429 and replaced by get_entity_name. Both new and old functions are used and this PR cleanup to remove the old function and use only the new one.

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[probot-home-assistant]

Hey there @balloob, @bieniu, mind taking a look at this pull request as its been labeled with an integration (shelly) you are listed as a codeowner for? Thanks!
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