Monorepo: Simplify coverage Command & Reactivate Reporting

[holgerd77]

This simplifies the coverage runs by removing the c8 tool usage and directly use the in-build vitest coverage functionality.

Beside being simpler goal is to reactivate coverage reporting for certain packages.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.85%. Comparing base (0440d5b) to head (59cc62c).
Report is 1 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
block	73.74% <ø> (ø)
blockchain	83.25% <ø> (ø)
client	74.01% <ø> (+74.01%)	⬆️
common	89.89% <ø> (ø)
devp2p	71.95% <ø> (ø)
evm	64.89% <ø> (ø)
genesis	100.00% <ø> (ø)
mpt	52.19% <ø> (+0.10%)	⬆️
rlp	95.11% <ø> (?)
statemanager	68.94% <ø> (ø)
tx	76.70% <ø> (ø)
util	72.78% <ø> (ø)
vm	57.37% <ø> (ø)
wallet	79.67% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[holgerd77]

We should clean these things up a bit at some point (not urgent! focus on your Devcon stuff!! 😋), so decide what to do with coverage.sh (still needed?), also align coverage commands, but I guess we can take in for now, coverage increase seems to be working?

Will do by admin-merge (own PR continued).