Fix RStudio installation on Debian 13 (trixie)

[DiwakarRana]

This PR updates the script to be compatible with Debian 13 (Trixie) and Ubuntu 24.04 (Noble) while maintaining full backward compatibility with older Dataproc versions:

1. Robust GPG Key Import:
   -----Added a fallback to gpg if apt-key is missing (deprecated in newer OS versions).
   -----Explicitly installs dirmngr alongside gnupg, which is required for GPG keyserver operations on minimal images.
   -----Uses the update_apt_get helper with retries to mitigate transient network failures during key import.
2. Bypassed add-apt-repository & Dynamic CRAN Suffix:
   -----Writes the CRAN repository definition directly to /etc/apt/sources.list.d/cran.list (faster and works out-of-the-box).
   -----Dynamically selects the CRAN repository suffix: uses cran46 for Debian 12/13 (which transitioned to R 4.6+) and falls back to cran40 for Ubuntu 22/24.
3. Upgraded RStudio Server Version (libssl3 Compatibility):
   -----For Debian 12 (bookworm), Debian 13 (trixie), Ubuntu 22.04 (jammy), and Ubuntu 24.04 (noble), the script now installs RStudio Server 2023.09.1-494 (which supports libssl3) instead of 1.2.5019 (which required the deprecated libssl1.1).
   -----Ensures the systemd service file path is correctly mapped for these newer OS versions when running in passwordless mode.

Detailed Changes:
Modified rstudio/rstudio.sh:

1. Updated GPG key import logic to support gpg fallback, install dirmngr, and use update_apt_get.
2. Implemented dynamic CRAN suffix selection (cran46 vs cran40) and direct writing to cran.list.
3. Updated RSTUDIO_SERVER_VERSION and service_file path logic to include bookworm, trixie, jammy, and noble.
4. Updated the supported_os list to include Debian 13 and Ubuntu 24.04.

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[gemini-code-assist]

Code Review

The pull request updates rstudio/rstudio.sh to support Debian trixie and handles the deprecation of apt-key by falling back to gpg for key management. It also simplifies the CRAN repository configuration by writing directly to a sources list file. The review feedback suggests improving the robustness of the package installation by using the update_apt_get helper, installing dirmngr alongside gnupg, and quoting variables. Additionally, it recommends dynamically setting the CRAN repository suffix to -cran46/ for Debian bookworm and trixie to ensure compatibility with newer R versions.

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