* Add get_radio helper function
This is defined here primarily for use in simplifying otherwise repetitive
logic in the lambdas for entity descriptions.
* Get firmware manifests for second radio
* Create optional update entity for radio 2
* Add info fixture for SLZB-MR1
* Test for firmware updates of second radio
* Remove use of entity description creating entities
* Add idx to lambda functions
* Add latest_version lambda to ED
* Use Single zb_update description
* test radio2 update
* device type heading for release notes
* fix failing no internet test
* update release note tests
* assert radios
* fix return type installed_version
* refactor latest_version code
* update listener
* Dont create update entities for legacy firmware that can't upgrade
* Address review comments for update listener
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