Add canRetry options to queue

[jgillick]

For some queues, I'd like to be able to clear jobs but never retry them.

This PR adds a allowRetries option that defaults to true and is superseded by readOnlyMode.

Example

const boardQueues = [new BullMQAdapter(commsQueue, { allowRetries: false })];
createBullBoard({
    serverAdapter: new ExpressAdapter(),
    queues: boardQueues,
});

Use Case
I have a queue responsible for notifications that are only relevant for a short period of time and if they fail, should not be retried. The bull dashboard is available by many people inside my company and I don't want others to accidentally hit the retry button and cause confusion for our users. However, clearing jobs is an important feature to keep.

readOnlyMode
Setting the readOnlyMode option will supersede this option and set allowRetries to false.

[felixmosh]

Thank you for this PR

I think that a better name would be allowRetries WDYT?

[jgillick]

@felixmosh That sounds good to me. I've updated the PR and added a couple unit tests.

[felixmosh]

Released in v3.10.0
Thank you for this PR 🙏🏼