[OZ][N-09] Non-Upgradable ConstantsManager Inherits Upgradeable Contracts

[Mike-CZ]

This PR replaces OwnableUpgradeable package with Ownable package for constants manager.

[thaarok]

What is the reason for this change?
The only difference should be the position of the storage slot. (At the start of the address space for Ownable, while at specific address for OwnableUpgradable.) It is not even cheaper, it only introduce another dependency into the code.

Update: The only reason for this change is to avoid confusion of auditors with the "Upgradable" name of the dependency. This was not even requested by them, they just need to get our confirmation this contract is not going to be upgradable.

[thaarok]

As discussed, it will be better this way.