fix(diagnostics): Updated flamegraph tutorial to use better tools

[wesleytodd]

Description

The current instructions for generating flamegraphs are functional but result in a pretty bad resulting view. These instructions use the tool maintained by the original creator of flamegraphs, and despite being older and in perl it really ouputs a better result.

Before:

After:

Validation

I have tested these tools, see the screenshots after following the updated guide.

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run npm run format to ensure the code follows the style guide.
• I have run npm run test to check if all tests are passing.
• I have run npx turbo build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

[vercel]

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Name	Status	Preview	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	Feb 4, 2025 4:14am

[AugustinMauroy]

Approve as nodejs website. Need to wait diagnostics WG approval before merging.

[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO	Report
/en	🟢 100	🟢 100	🟢 100	🟢 91	🔗
/en/about	🟢 100	🟢 100	🟢 100	🟢 91	🔗
/en/about/previous-releases	🟢 100	🟢 100	🟢 100	🟢 92	🔗
/en/download	🟢 98	🟢 100	🟢 96	🟢 91	🔗
/en/blog	🟢 100	🟢 100	🟢 100	🟢 92	🔗

[github-actions]

Unit Test Coverage Report

Lines	Statements	Branches	Functions
	88.71% (739/833)	75.94% (240/316)	87.65% (142/162)

Unit Test Report

Tests	Skipped	Failures	Errors	Time
182	0 💤	0 ❌	0 🔥	6.613s ⏱️