refactor(connector-fabric): reusable error handler in REST endpoints

[ArchanaArige]

1. Error-handling : Updates to the catch block of the Rest API endpoints of fabric package by importing the utility function handleRestEndpointException from cactus-core package that differentiates the user/developer errors.
2. Minor code changes in the endpoints like adding the functions and formulating the error messages.

Pull Request Requirements

• Rebased onto upstream/main branch and squashed into single commit to help maintainers review it more efficient and to avoid spaghetti git commit graphs that obfuscate which commit did exactly what change, when and, why.
• Have git sign off at the end of commit message to avoid being marked red. You can add -s flag when using git commit command. You may refer to this link for more information.
• Follow the Commit Linting specification. You may refer to this link for more information.

Character Limit

• Pull Request Title and Commit Subject must not exceed 72 characters (including spaces and special characters).
• Commit Message per line must not exceed 80 characters (including spaces and special characters).

A Must Read for Beginners
For rebasing and squashing, here's a must read guide for beginners.

[petermetz]

@ArchanaArige This is looking great! Thank you very much for the contribution!

There were a couple of linter errors due to lack of auto-formatting applied to the code so I ran the auto-formatter and force pushed the changes to your branch to fix the CI checks.
Now it all should be green and ready to go. LGTM