[Accelerator] - Update default configurations in toml file to support super admin credential change

[malshaniS]

Description:
Some of the configurations related to super admin credential are hardcoded in deployment.toml file. But this hard coded values affects the functionalities if someone change the super admin credential when setting up the OB solution. Therefore, following configurations in APIM depolyment.toml file should be modified to read super admin property without hardcoding them.

The config should be updated as below.

[apim.analytics]
properties.'stream.processor.rest.api.username' = "$ref{super_admin.username}@carbon.super"

[apim.throttling]
username = "$ref{super_admin.username}@carbon.super"

[apim.throttling.jms]
username = "$ref{super_admin.username}!wso2.com!carbon.super"

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