feat: use compact for prefix and suffix variables in locals

[bonddim]

This pull request makes a small but important improvement to how prefixes and suffixes are handled in the main.tf Terraform configuration. The main change ensures that any empty values in the var.prefix and var.suffix lists are removed before being joined, which helps prevent unwanted dashes or empty segments in generated names.

• Improved name generation:
  • Updated all uses of var.prefix and var.suffix in local variables to use the compact() function, which removes empty values before joining. This results in cleaner, more predictable resource names and avoids issues caused by empty list elements.

[Copilot]

Pull request overview

This PR improves Terraform name generation in main.tf by ensuring any empty elements in var.prefix and var.suffix are removed before constructing derived local values, preventing accidental empty segments and stray dashes in generated resource names.

Changes:

• Apply compact() to var.prefix when computing local.prefix and local.prefix_safe.
• Apply compact() to var.suffix when computing local.suffix, local.suffix_safe, and the *_unique* variants that append local.random.

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