fix: A series of small changes to stabilize tests

[ebadiere]

Description:
This PR adds the checking of connection as part of a connection handling process for the afterEach hook in the tests. It also removes a Utils.wait by resolving a promise before continuing, and adds some gas deviation.

Related issue(s):

Fixes #3204

[github-actions]

Test Results

   23 files  + 22  338 suites  +329   1h 27m 25s ⏱️ + 1h 26m 48s
  588 tests +582  538 ✅ +532  4 💤 +4   46 ❌ + 46 
1 046 runs  +984  913 ✅ +851  6 💤 +6  127 ❌ +127 

For more details on these failures, see this check.

Results for commit 8a9d0c4. ± Comparison against base commit 3bd07ef.

♻️ This comment has been updated with latest results.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
2.8% Duplication on New Code

See analysis details on SonarQube Cloud

[quiet-node]

The team will triage and address this in upcoming sprints. Thanks for the great work @ebadiere!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.85%. Comparing base (3bd07ef) to head (8a9d0c4).
Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3242      +/-   ##
==========================================
- Coverage   83.17%   77.85%   -5.32%     
==========================================
  Files          66       66              
  Lines        4314     4453     +139     
  Branches      843      993     +150     
==========================================
- Hits         3588     3467     -121     
- Misses        483      613     +130     
- Partials      243      373     +130     

Flag	Coverage Δ
config-service	98.14% <ø> (ø)
relay	78.59% <ø> (-6.71%)	⬇️
server	83.28% <ø> (-0.25%)	⬇️
ws-server	36.66% <ø> (-0.21%)	⬇️

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see 20 files with indirect coverage changes