feat: allow overriding S3 bucket names in dns-bucket module

[maxsxu]

Motivation

Currently, S3 bucket names in the dns-bucket module are automatically generated based on the pm_name and pm_namespace. There are cases where users might want to use custom bucket names or match existing buckets. This change introduces override variables for Velero, Tiered Storage, and Loki buckets.

Modifications

• Added velero_bucket_name, tiered_storage_bucket_name, and loki_bucket_name variables to modules/dns-bucket/variables.tf.
• Updated aws_s3_bucket resources in modules/dns-bucket/bucket.tf to use coalesce with these new variables, defaulting to the existing generated names if the overrides are not provided.
• Updated modules/dns-bucket/README.md using terraform-docs.

Verifying this change

• Make sure that the change passes the CI checks.

This change is a trivial rework allowing for more flexibility in naming.

Documentation

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Need to update docs?

• doc-required

• no-need-doc

  Variables are self-documented in Terraform and README has been updated.