devops: Lighthouse CI runs only a single sample, producing noisy/flaky metrics

[Austinaminu2]

Problem

The Lighthouse CI action config in `.github/workflows/lighthouse.yml` uses `runs: 1`, producing a single noisy/flaky performance sample instead of a median-of-N.

Location

`.github/workflows/lighthouse.yml`

Impact

Single-run Lighthouse scores are known to vary significantly run-to-run due to system load/network variance, making the resulting numbers unreliable for tracking real regressions.

Suggested fix

Increase `runs` to at least 3 and use the median/average score for budget assertions.

[dahmeezy]

@dahmeezy has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would love to work on this issue, please assign it to me

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[GauravKarakoti]

@GauravKarakoti has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Allow me to work on this one

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[The-moving-man]

@The-moving-man has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

hey maintainer, please consider my application to this

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This issue has been completed by @The-moving-man as part of the Stellar Wave Program's 7th Wave 🥳

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