fix(ethernet): move event listener earlier to avoid missing event ETH_CONNECTED

[s-hadinger]

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Description of Change

With Olimex POE board and latest Core3, IPv6 link-local IPv6 address is not assigned to ETH. The reason is that event ETH_CONNECTED is fired right after the ETH is created, and before Network.onSysEvent(onEthConnected, ARDUINO_EVENT_ETH_CONNECTED); is reached; hence ETH_CONNECTED is lost, and IPv6 address is not assigned.

Tests scenarios

Core3 with Olimex POE board (ESP32), using Tasmota.

Related links

#8796 (comment)

[github-actions]

Warnings

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Some issues found for the commit messages in this PR: the commit message "Ethernet: Move event listener earlier": type/action should start with a lowercase letter type/action should be one of [change, ci, docs, feat, fix, refactor, remove, revert, test] Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

👋 Hello s-hadinger, we appreciate your contribution to this project!

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