[dashboard] Simplify deploy preview to always-valid homepage link

[Janpot]

Problem

The Deploy preview comment tried to deep-link each changed doc page by mapping the source path to a published URL. That mapping is unreliable and produced 404s:

• Component pages: docs/data/material/components/buttons/buttons.md → /material-ui/components/buttons (404); the real URL is /material-ui/react-button/ (slug comes from routing config, not the folder).
• Section pages: a stray .replace(/(customization|guides|…)/, 'material-ui/$1') doubled the prefix → /material-ui/material-ui/customization/palette (404), as seen on [docs] Add blog post for enhanceHighContrast material-ui#48753.
• Non-.md changes (demos, teamMembers.json) were detected as nothing.

Change

Stop guessing per-page URLs. The deploy-preview root is the only link we can build reliably, so:

• Always show the homepage preview link (with QR code), whether or not docs changed.
• List changed doc files as plain text (no fragile links), filtered by a simple docsPath prefix per repo (docs/data/ for material-ui & mui-x, docs/app/docs-infra/ for mui-public).
• Remove the formatDocPath URL-mapping config entirely.

Fixes the #48753 broken link and removes the component 404s.

[code-infra-dashboard]

Deploy preview

https://deploy-preview-1645--mui-internal.netlify.app/

Bundle size

Total Size Change: 0B^(0.00%) - Total Gzip Change: 0B^(0.00%)
Files: 69 total (0 added, 0 removed, 0 changed)

Show details for 69 more bundles

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Details of bundle changes

Performance

Total duration: 15.83 ms ▼-4.18 ms^(-20.9%) | Renders: 5 ⁽⁺⁰⁾

Test	Duration	Renders
HeavyList mount	7.51 ms ▼-3.47 ms(-31.6%)	1 (+0)
DataGrid mount with paint timing	2.10 ms ▼-0.72 ms(-25.5%)	1 (+0)

5 tests within noise — details

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Check out the code infra dashboard for more information about this PR.

[brijeshb42]

On a side note - I feel the configuration for repos should live on the repo itself somehow.

[Janpot]

Opening #1649