refactor: rename EFAILEDEVAL → EINVALEVAL

[Kikobeats]

Note

Medium Risk
Changes the public error code emitted by evaluationFailed from EFAILEDEVAL to EINVALEVAL, which can break consumers that match on the old code/string. Logic is otherwise unchanged and covered by updated tests/docs.

Overview
Renames the evaluationFailed error code from EFAILEDEVAL to EINVALEVAL in @browserless/errors, affecting both directly-created errors and errors normalized via ensureError.

Updates the package README examples and the AVA test expectations to reflect the new code/message format.

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