New return types to RegisterEnity and New errror codes

[Jougan-0]

Description

This PR fixes #

Notes for Reviewers New return types added so that can verify if the Registry error was because of model or registrant for the particular entity Few new error codes too.

Signed commits

• [x] Yes, I signed my commits.

[Jougan-0]

@Yashsharma1911 @MUzairS15 please review here the old pr was causing issue with the release

[leecalcote]

@Jougan-0 will you address the failed lint checks?

[leecalcote]

@Jougan-0 provide a more description PR title, please.

[Jougan-0]

@Jougan-0 will you address the failed lint checks?

It's now my code error i guess becuase other pr have the linting error as well . If you want me to look why the linting error is caused I'll am looking into it . Currently I am studying the CKA and models so that I can create a proposal for the Gsoc issue .

[Jougan-0]

https://github.com/meshery/meshery/pull/10567

[vishalvivekm]

@Jougan-0 Let's discuss this in Meshery dev call today. Add this as an agenda item to the meeting minutes, if you would :)

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