Authentication configs not set correctly during client generation

[KamalikaSene]

Description: The client.bal generated using the openapi specification for discord resulted in a bug where when generating the client the authentication related configs are not properly set.

Steps to reproduce: Link to the generated client (line 58) - https://github.com/KamalikaSene/module-ballerinax-discord/blob/main/ballerina/client.bal

config.auth = <OAuth2ClientCredentialsGrantConfig|http:BearerTokenConfig|OAuth2RefreshTokenGrantConfig>config.auth;

Link to the OpenAPI spec - https://github.com/KamalikaSene/module-ballerinax-discord/blob/main/ballerina/openapi.json

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      - Reason/EngineeringMistake - The issue occurred due to a mistake made in the past.
      - Reason/Regression - The issue has introduced a regression.
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      - Reason/Complex - Issue occurred due to complex scenario.
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