Docs: Add plugin "cypress-load-balancer"

[hammzj]

What

Adds community plugin under "Framework Tooling" for https://github.com/hammzj/cypress-load-balancer/

Checklist

• has Integration Tests with Cypress (example workflows provided)
• has CI pipeline (using GitHub Actions)
• Compatibility with at least the latest major version of Cypress
  • Demonstrated to work with v14 in this workflow run
  • local example provided on v15.5.0
  • local example provided on v10.11.0
  • peerDependencies set for all major versions, 10+
• Populated package.json fields

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Screenshots of local runs:

Cypress v15.5.0

Cypress v14.5.0

Cypress v10.11.0

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[jennifer-shehane]

@hammzj I think this would be better in the 'Development Tools' section of the Plugins. Could you move it?

[hammzj]

@jennifer-shehane I moved it to the suggested section and updated the PR to include a checklist based on the contributing guidelines.