fix: web serial disconnect logic

[chmelevskij]

This PR fixes the disconnect on web version.

Mainly had to properly clean up even listeners, due to how we historically had serial connection as singleton. In the future we can instead create new WebSerial instance and destroy on disconnect allowing garbage collector to handle that.

But for now will just explicitly remove even listeners before adding the new ones.

Screen.Recording.2023-09-11.at.08.10.10.mov

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[github-actions]

Do you want to test this code? Here you have an automated build:
Betaflight-Configurator-Android
Betaflight-Configurator-Linux
Betaflight-Configurator-macOS
Betaflight-Configurator-Windows
WARNING: It may be unstable and result in corrupted configurations or data loss. Use only for testing!

[blckmn]

AUTOMERGE: (FAIL)

• github identifies PR as mergeable -> PASS
• assigned to a milestone -> PASS
• cooling off period lapsed -> PASS
• commit count less or equal to three -> PASS
• Don't merge label NOT found -> PASS
• at least one RN: label found -> PASS
• Tested label found -> FAIL
• assigned to an approver -> PASS
• approver count at least three -> FAIL

[nerdCopter]

4dcae8e5 tested good for disconnect button via yarn vite.
yarn gulp debug work as well.

remaining to do: save and reboot to disconnect.