Solve queueSize exceeded when using job arrays

[jorgee]

close #5920

• Modifying canSubmit to avoid to avoid exceed executor.queueSize parameter.
• Printing warning when array size exceeds the queueSize. This can make the task array 'unsubmitable' (Not sure if we should abort the execution in this situation)
• Add unit tests

Tested with this pipeline

process test {
    array 10 
    input:
    val x

    """
    echo $x
    """
}

workflow {
   Channel.of(1..20) | test
}

With a config with awsbatch executor and different executor.queueSize values:

• size 15: Only one job submitted at a time in AWS Batch.
• size 5: Prints a warning but run continues without the task array jobs submitted.

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