perf: remove stale runnables obj

[emilyrohrbough]

Apart of #23391
Apart of #21135

While profile Cypress to determine the memory impact we have, I noticed we are collecting all of the runnables in an object when we normalize the spec, however we are doing nothing with this data. Each runnable reference include data about its suites, hooks, tests, parent (including parent's suites, hooks, tests).

Deleting this code to reduce our memory footprint. The performance will be relative to the size of the spec being ran.

Some examples:

• driver/cypress/e2e/commands/actions/click.cy.js stored 241 runnable references
• driver/cypress/e2e/commands/navigation.cy.js stored 191 runnable references
• driver/cypress/e2e/commands/actions/submit.cy.js stored 30 runnable references

User facing changelog

I'd all recent performance improvements as one line-item

PR Tasks

• [n/a] Have tests been added/updated?
• [n/a] Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• [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-bot]

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[cypress]

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Test summary

40010 • 0 • 3346 • 0 • 1

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Run details

Project	cypress
Status	Passed
Commit	f1a3db1
Started	Sep 8, 2022 9:52 PM
Ended	Sep 8, 2022 10:07 PM
Duration	15:10 💡
OS	Linux Debian - 11.3
Browser	Multiple

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/e2e/e2e/origin/commands/log.cy.ts		1
1	cy.origin log > logs in primary and secondary origins

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[BlueWinds]

Great change. Runnables keep references to all sorts of information, IIRC, so they can be fairly large.

[cypress-bot]

Released in 10.8.0.

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