fix: event.target.getAttribute('target') returns null when it does not exist.

[sainthkh]

• Closes Cypress 7 & 8 changed Element.getAttribute #17512

User facing changelog

event.target.getAttribute('target') returns null when it does not exist. This behavior is introduced in #16394.

Additional details

• Why was this change necessary? => It's not the default browser behavior.
• What is affected by this change? => N/A
• Any implementation details to explain? => We're checking if the e.target.target is set or not and returns null it isn't.

How has the user experience changed?

function handleClick(e) {
  e.target.getAttribute('target') // => before: '', after: null
}

PR Tasks

• Have tests been added/updated?
• [na] Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• [na] Has a PR for user-facing changes been opened in cypress-documentation?
• [na] Have API changes been updated in the type definitions?
• [na] Have new configuration options been added to the cypress.schema.json?

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