Merge latest audited contracts

[rogarcia]

I merged the audited contracts (from the cqt-staking repo main branch) and committed hardhat tooling updates (current nodejs v18.20.2 LTS + Openzepplin Defender 2.0 dependencies).
Tests removed for now (we need to copy updated ones from the private repo (cqt-staking) - but need to sanitized/tested before that).
This ensures contract upgrade proposals work with Openzepplin Defender 2.0.

[noslav]

Approving a merge on the basis of -

1. Two separate audits for staking contract migration to Ethereum with proof-chain on Moonbeam and bridge-agent (StakingManager) operation, those can be found here -
   a. Quantstamp - https://github.com/covalenthq/ewm-contracts/blob/main/audits/operational-staking/v3/quantstamp.pdf
   b. Sherlock - https://github.com/covalenthq/ewm-contracts/blob/main/audits/operational-staking/v3/sherlock.pdf

2. Zero diff on deployed in production Ethereum mainnet contracts BSP-Staking , BRP-Staking and Moonbeam mainnet contracts BSP-ProofChain BRP-ProofChain for contract code added in this PR https://github.com/covalenthq/ewm-contracts/tree/main/contracts -
   a. contracts/BlockResultProofChain.sol
   b. contracts/BlockSpecimenProofChain.sol
   c. contracts/OperationalStaking.sol

3. Previously added tests have been removed on approval to keep CI runs simple without any tests (they are mentioned in the reports however), deleted en masse -
   a. test/proof-chain/unit-tests/**
   b. test/operational-staking/unit-tests/**

4. Updated ABIs and audit reports
   a. https://github.com/covalenthq/ewm-contracts/tree/main/audits/operational-staking/v3
   b. https://github.com/covalenthq/ewm-contracts/tree/main/generated-abis