fix(reporter): virtualize reporter pane elements when not visible

[flotwig]

• Closes Tests slow down over time when performing several XHR requests calls in single test #6783

User facing changelog

Fixed an issue where Cypress would slow down incrementally with every new test, suite, spy, stub, or command log.

Additional details

• virtualizes entire reporter tree, from the suites down to the commands

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has the original issue been tagged with a release in ZenHub?
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?
• Have new configuration options been added to the cypress.schema.json?

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[badeball]

Can this tree be built and tested by outside people? I'm very curious about the impact.