Remove session end/start from core and provide generic request and response Headers on context instead of node-specific req/res

[emmatown]

Supersedes #8097

Stacked on #9578

[socket-security[bot]]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​types/​express-session@​1.18.2
	async-retry@​1.3.3
	@​as-integrations/​next@​3.2.0
	astro@​4.16.19

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