fix(zk init): --run-observability flag

[fborello-lambda]

What ❔

Run DockProm (Grafana) whenever zk init --run-observability is executed.

Why ❔

This functionality was not working on the main branch. Referencing the commit that implements this feature:
feat: add run-observability to zk (#1359) · matter-labs/zksync-era@2b520f6

How to Reproduce:

• New dependency: yq

git clone https://github.com/matter-labs/zksync-era.git
cd zksync-era
export ZKSYNC_HOME=$(pwd)
export PATH=$ZKSYNC_HOME/bin:$PATH
zk && zk clean --all && zk env dev && zk init --run-observability && zk server

The port :3000 serves the dashboard.

• usr: admin
• pwd: admin

Several transactions were generated in order to test the Grafana's dashboard:

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• Code has been formatted via zk fmt and zk lint.
• Spellcheck has been run via zk spellcheck.