feat(installer): support installing Chrome and Edge on RPM-based Linux

[alpham8]

Summary

• npx playwright install chrome / install msedge previously failed on every
  non-Debian distribution with "cannot install on … distribution — only Ubuntu
  and Debian are supported".
• The reinstall_chrome_* and reinstall_msedge_* scripts now detect the
  distribution from /etc/os-release and install through the matching package
  manager:
  • apt / .deb — Debian, Ubuntu (unchanged)
  • zypper / .rpm — openSUSE, SLES
  • dnf (fallback yum) / .rpm — Fedora, RHEL, CentOS, Rocky, AlmaLinux, Amazon Linux
• Microsoft Edge registers Microsoft's official Edge yum/zypper repository and
  installs microsoft-edge-{stable,beta,dev}; Chrome imports Google's signing
  key and installs the official google-chrome-{stable,beta} RPM.
• Distributions with no vendor package (Arch/CachyOS, Alpine, Gentoo, NixOS, …)
  now print a clear, actionable hint (e.g. the AUR package name, or "use the
  bundled Chromium") instead of a hard failure.

Notes

• Package sources verified to exist (Google Chrome RPM + linux_signing_key.pub;
  packages.microsoft.com/yumrepos/edge + microsoft.asc).
• The actual install runs as root via Playwright's existing sudo wrapper, so it
  cannot be exercised non-interactively in CI; manual verification was done on
  openSUSE Tumbleweed.

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