Fix the Hardhat setup

[vtleonardo]

Scope

This PR is refactoring how the hardhat node is executed by the golang unit tests. This PR is removing the dependency on the bash scripts and executing hardhat and the deploy scripts directly. In addition to this, all the integration tests are being fixed to work with the new code (after the layer1 refactoring).

Why?

All unit tests should pass after the big refactoring :)

Blocked by #11

[ghost]

Approving with the understanding that we're going to cleanup after all PR's are merged.

[codecov-commenter]

Codecov Report

Merging #36 (0703a2c) into main (68abddf) will increase coverage by 0.59%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   45.03%   45.63%   +0.59%     
==========================================
  Files         220      214       -6     
  Lines       40002    38484    -1518     
==========================================
- Hits        18016    17563     -453     
+ Misses      20023    18989    -1034     
+ Partials     1963     1932      -31     

Impacted Files	Coverage Δ
config/settings.go	0.00% <ø> (ø)
layer1/executor/tasks/dkg/utils/utils.go	7.69% <ø> (ø)
layer1/monitor/objects/event_map.go	0.00% <ø> (ø)
layer1/monitor/objects/state.go	0.00% <ø> (ø)
layer1/transaction/backend.go	0.86% <ø> (ø)
layer1/transaction/errors.go	0.00% <ø> (ø)
layer1/transaction/transaction.go	0.00% <ø> (ø)
layer1/transaction/worker_pool.go	0.00% <ø> (ø)
utils/leader_election.go	0.00% <ø> (ø)
utils/shared.go	56.36% <ø> (-26.31%)	⬇️
... and 10 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b541468...0703a2c. Read the comment docs.