chore: Document process.env.DEBUG in node integration tests README

[AbhiPrasad]

A new "Debugging Tests" section was added to dev-packages/node-integration-tests/README.md.

This section documents the DEBUG environment variable, which enables verbose logging for the integration test suite.

When DEBUG=1 is set (e.g., DEBUG=1 yarn test), the test runner provides detailed output, including:

• Test scenario startup information (path, flags, DSN).
• Docker Compose output when tests use withDockerCompose.
• Child process stdout and stderr.
• HTTP requests made during tests.
• Process errors and exceptions.
• Line-by-line output from test scenarios.

This addition improves discoverability and understanding of the debugging capabilities, aiding in troubleshooting failing tests and analyzing test execution flow.

[github-actions]

⚠️ This PR is opened against master. You probably want to open it against develop.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.99 kB	-	-
@sentry/browser - with treeshaking flags	23.76 kB	-	-
@sentry/browser (incl. Tracing)	38.36 kB	-	-
@sentry/browser (incl. Tracing, Replay)	76.47 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	69.57 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	81.23 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	93.31 kB	-	-
@sentry/browser (incl. Feedback)	40.73 kB	-	-
@sentry/browser (incl. sendFeedback)	28.7 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.59 kB	-	-
@sentry/react	25.76 kB	-	-
@sentry/react (incl. Tracing)	40.35 kB	-	-
@sentry/vue	28.36 kB	-	-
@sentry/vue (incl. Tracing)	40.21 kB	-	-
@sentry/svelte	24.01 kB	-	-
CDN Bundle	25.48 kB	-	-
CDN Bundle (incl. Tracing)	38.55 kB	-	-
CDN Bundle (incl. Tracing, Replay)	74.42 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	79.87 kB	-	-
CDN Bundle - uncompressed	74.48 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	114.16 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	228.13 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	240.95 kB	-	-
@sentry/nextjs (client)	42.01 kB	-	-
@sentry/sveltekit (client)	38.84 kB	-	-
@sentry/node	150.48 kB	-	-
@sentry/node - without tracing	98.35 kB	-0.01%	-1 B 🔽
@sentry/aws-serverless	124.11 kB	-	-

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