[Housekeeping] Use official mockery library for generating mocks

[katrogan]

Describe the issue

We currently use @EngHabu's 6 year old fork here:
https://github.com/search?q=repo%3Aflyteorg%2Fboilerplate%20enghabu&type=code

although upstream now supports OnFoo method declarations and asserting method called expectations: https://github.com/vektra/mockery

What if we do not do this?

Harder to contribute code for newer contributors and the codebase don't get upstream changes

Related component(s)

testing

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[dosubot]

🤖

It's great to see your interest in improving the repository! Using the official mockery library for generating mocks would indeed make it easier for newer contributors to understand and contribute to the codebase. Your proposed solution would be a valuable addition. Thank you for considering this improvement!

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