Update angular-cli monorepo to v21.2.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@angular/build	21.2.7 → 21.2.8
@angular/cli	21.2.7 → 21.2.8

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Release Notes

angular/angular-cli (@​angular/build)

v21.2.8: 21.2.8

Compare Source

@​angular/cli

Commit	Description
	dynamically resolve project Angular CLI executable inside MCP tools
	ignore EBADF file system errors during MCP project scan
	use headless option in MCP test tool

@​angular-devkit/build-angular

Commit	Description
	ensure route has leading slash in prerender builder
	fix app-shell route format and

@​angular/build

Commit	Description
	use rootDir for HMR component updates path resolution
	validate V8 coverage support for browsers in Vitest

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