Resolve "Updates for simplified ironbank-modules releases"

Description

• Update release process to use env var for tags
• Move and refactor templates

Before this is merged, we'll need to:

• Add a MODULES_TAG ci var to the dsop group with the latest version

Risk

Medium - If anything is misconfigured, this change could break pipelines

Rollback Plan

Revert MR

Testing

• https://code-ib-zelda.staging.dso.mil/dsop/Kenn/static/-/pipelines/5701
• https://code-ib-zelda.staging.dso.mil/dsop/Kenn/ubi8/-/pipelines/5702
• https://code-ib-zelda.staging.dso.mil/dsop/Kenn/openjdk11/-/pipelines/5703

Example with bumped tag in env var

• https://code-ib-zelda.staging.dso.mil/dsop/Kenn/openjdk11/-/pipelines/5710

Relates to #905 (closed) Closes #888