Release v3.15.0

feat: allocation manager migration for slashing ux improvements (#496)

## Description

For the slashing UX release, we need to update the allocation manager on
mainnet for the latest ABIs

## Type of change

Please delete options that are not relevant.

- [x] Chore (non-breaking change which does not add functionality)

## How Has This Been Tested?

Active on testnet

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged and published in downstream
modules
- [x] I have checked my code and corrected any misspellings