Modify the PLP's Apex to use the Connect API in Apex instead of callout to SF REST endpoint

[peterTrifecta]

https://github.com/forcedotcom/b2b-commerce-on-lightning-quickstart/blob/741479e9eca0ba6b73f4bf503427fe3357ba34c1/examples/lwc/force-app/main/default/classes/B2BSearchControllerSample.cls#L25

That code still uses the REST API, but there is a method in Apex now. https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_ConnectAPI_CommerceSearch_static_methods.htm#apex_ConnectAPI_CommerceSearch_productSearch_1

[github-actions[bot]]

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