Add Jest to hold ring

[gunzip]

• I've added a short description of the entry that
  clarifies what it does and why it's useful
• I've added links to the entry's documentation and/or
  website
• My frontmatter is correct, complete and follows the
  format specified in the README
• In case the entry is in the adopt category: I've
  added at least one reference to showcase the entry usage
  among our organization
• I've described at least one use case for the entry

[francescopersico]

If we are still evaluating (trial) other testing frameworks like Vitest i suggest to maintain Jest to adopt ring.
If we are confident that Vitest is the solution we want to adopt, is ok to hold Jest.

[gunzip]

Vitest is being proposed in adopt ring https://github.com/pagopa/technology-radar/pull/71/files