feat: add session support

[kuceb]

• Closes Add session API for snapshotting/restoring session related data (cookies, localStorage, sessionStorage) #8301
• fix "Removing cookie failed for" error in Firefox after setting cookie via cy.setCookie() #6375

User facing changelog

changes to default blank page and useSession blank page:

before	after
n/a

Additional details

How has the user experience changed?

PR Tasks

• remove user facing api changes to getCookie/setCookie, support hostOnly in backend only

• Have tests been added/updated?
• Has the original issue or this PR been tagged with a release in ZenHub?
• Docs PR: docs for experimental session API cypress-documentation#3427
• Have API changes been updated in the type definitions?
• Have new configuration options been added to the cypress.schema.json?

[cypress-bot]

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[cypress]

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Test summary

8276 • 0 • 100 • 4 • 1

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Run details

Project	cypress
Status	Passed
Commit	8d53c5b
Started	Aug 4, 2021 2:12 PM
Ended	Aug 4, 2021 2:22 PM
Duration	10:16 💡
OS	Linux Debian - 10.8
Browser	Multiple

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/commands/net_stubbing_spec.ts		1
1	network stubbing > waiting and aliasing > can incrementally wait on responses

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[flotwig]

noice