Mark {add,remove}EventListener() as removed in migration guide

[mrbbot]

Miniflare no longer emits reload events. As Miniflare no longer watches files, reloads are only triggered by initialisation or setOptions() calls. In these cases, it's possible to wait for the reload with either await mf.ready or await mf.setOptions() respectively.

Ref: #602

[changeset-bot]

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