perf: ensure the pausing event listeners are removed

[mschile]

• Closes n/a

Additional details

In open mode, when a new spec is run or the existing spec is rerun, we aren't clearing the reporter listeners in pausing.ts. Updated handlePausing() to ensure the previous event listeners are removed before new ones are added.

Steps to test

In open mode, rerun a spec more than 10 times and verify the event emitters memory leak message is not received:

index-BJMNOmDZ.js:80727 MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 runner:next listeners added. Use emitter.setMaxListeners() to increase limit
    at _addListener (https://example.cypress.io/__cypress/assets/assets/index-BJMNOmDZ.js:80848:18)
    at EventEmitter.addListener (https://example.cypress.io/__cypress/assets/assets/index-BJMNOmDZ.js:80859:12)
    at handlePausing (https://example.cypress.io/__cypress/assets/assets/index-BJMNOmDZ.js:81077:15)
    at EventManager._addListeners (https://example.cypress.io/__cypress/assets/assets/index-BJMNOmDZ.js:86525:5)
    at EventManager.setup (https://example.cypress.io/__cypress/assets/assets/index-BJMNOmDZ.js:86359:10)
    at Object.executeSpec (https://example.cypress.io/__cypress/assets/assets/index-BJMNOmDZ.js:86909:27)
    at async runSpec (https://example.cypress.io/__cypress/assets/assets/Runner-B30ckd2e.js:7914:5)
    at async EventEmitter.<anonymous> (https://example.cypress.io/__cypress/assets/assets/Runner-B30ckd2e.js:7920:9)

How has the user experience changed?

Before (test fails showing we have two listeners attached when there should've only been one):

After (test passes showing the correct amount of listeners attached):

PR Tasks

• Have tests been added/updated?
• [n/a] Has a PR for user-facing changes been opened in cypress-documentation?
• [n/a] Have API changes been updated in the type definitions?

[cypress]

cypress    Run #62044

Run Properties:   Passed #62044  •  8e82264aa0: Merge branch 'develop' into mschile/handle_pausing

Project	cypress
Branch Review	mschile/handle_pausing
Run status	Passed #62044
Run duration	19m 06s
Commit	8e82264aa0: Merge branch 'develop' into mschile/handle_pausing
Committer	Matt Schile
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	9
Pending	1232
Skipped	0
Passing	32150
View all changes introduced in this branch ↗︎

UI Coverage  46.33%
Untested elements	185
Tested elements	164

Accessibility  92.7%
Failed rules	3 critical   8 serious   2 moderate   2 minor
Failed elements	887

[cypress-bot]

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