Remove deprecated API

[hendrikebbers]

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This issue is reserved for people who have never contributed to this project or any open source software (OSS) in general.
We know that creating a pull request (PR) is a major barrier for new contributors.
The goal of this issue and all other issues labeled by 'good first issue' is to help you make your first contribution.

👾 Description of the issue

Once all known usage of the deprecated API is refactored, we can remove it. Todo, so hiero-ledger/hiero-website#13 and #6 need to be fixed. The deprecated API can be found at https://github.com/OpenElements/good-first-issue-provider/blob/main/src/main/java/com/openelements/issues/ApiEndpoint.java

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[3looy-hubs]

Hi @hendrikebbers Can you assign me

[S-HEMANTH-REDDY]

Hi interested in solving the issue.