fix(automerge): implement exponential backoff

[Ben10k]

Description

Retry mechanism with exponential backoff is implemented for automatically merging PRs.

Resolves #176

Type of Change

• [x] Bug Fix
• [ ] New Feature
• [ ] Breaking Change
• [ ] Refactor
• [ ] Documentation
• [ ] Other (please describe)

Checklist

• [x] I have read the contributing guidelines
• [x] Existing issues have been referenced (where applicable)
• [x] I have verified this change is not present in other open pull requests
• [ ] Functionality is documented
• [x] All code style checks pass
• [ ] New code contribution is covered by automated tests
• [x] All new and existing tests pass

[Ben10k]

I'll fix the linting error, most likely tomorrow. ot sure what to do with the failing docker build?

[Oded-B]

Yeah, the docker build is unrelated. I'll try to take a look, but I will not block this pr if it's the only issue, worst case I'll validate it locally

[Ben10k]

@Oded-B linting issues fixed, can you approve workflows and tale a look?