Test: staking scripts for UI mocks

[roxdanila]

Context

Scripts required for UI mocks.
Closes #664
Depends on #639

Changes proposed in this pull request

Reimplementing existing scripts so deposits and buy covers work well.

Test plan

You can run locally:

• ABI_DIR=../frontend-react/src/constants/abis CONFIG_FILE=../frontend-react/config/local.json node scripts/deploy/start.js
  Then:
• HARDHAT_NETWORK=localhost CONFIG_FILE=$PWD/../frontend-react/config/local.json node scripts/mocks/fund.js 0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266
• HARDHAT_NETWORK=localhost CONFIG_FILE=$PWD/../frontend-react/config/local.json node scripts/mocks/createStakingPools.js
• HARDHAT_NETWORK=localhost CONFIG_FILE=$PWD/../frontend-react/config/local.json STAKER=0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266 node scripts/mocks/depositToStakingPools.js
• HARDHAT_NETWORK=localhost CONFIG_FILE=$PWD/../frontend-react/config/local.json BUYER=0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266 node scripts/mocks/buyV2Covers.js

Checklist

• Rebased the base branch
• Attached corresponding Github issue
• Prefixed the name with the type of change (i.e. feat, chore, test)
• Performed a self-review of my own code
• Followed the style guidelines of this project
• Made corresponding changes to the documentation
• Didn't generate new warnings
• Didn't generate failures on existing tests
• Added tests that prove my fix is effective or that my feature works

Review

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