chore: add script for targetted e2e

[james-elicx]

REPO=/path/to/vinext-worktree \
NEXTJS_DIR=/path/to/vinext/.nextjs-ref \
./run-targeted-nextjs-e2e.sh test/e2e/app-dir/app-basepath/index.test.ts

[pkg-pr-new]

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npm i https://pkg.pr.new/@vinext/cloudflare@2439

npm i https://pkg.pr.new/vinext@2439

commit: e879a09

[github-actions]

Example	Preview	Production	Original
app-router-cloudflare	preview	production
pages-router-cloudflare	preview	production
app-router-playground	preview	production	original
realworld-api-rest	preview	production
nextra-docs-template	preview	production
benchmarks	preview	production
hackernews	preview	production	original
workers-cache	preview	production
web	preview	production