Change config name in the drupalSettings object to use machine name of block instead

Problem/Motivation

Config Name as a unique key for the drupalSettings.salesforce_mfw object will not work when there are multiple instances of the same Salesforce utility that needs to be configured on the site. Each utility would have the same config name, leading to overwriting of existing configuration in the drupalSettings object. It would likely be better to key off of the unique identifier of the block plugin instance.

Steps to reproduce

Create two instances of a Salesforce MFW block and give them the same config name
Verify that only one exists in your drupalSettings.salesforce_mfw.

Proposed resolution

Update block plugin to use the block plugin id (machine id) instead of config_name.
Update the module hook to also use the block->id() instead of config_name