Update the templates pipelines

[theopnv]

Purpose of this PR

• Removed the optional pre-pack step from the templates pipelines (slack thread).
  - Added the templates pipelines to the nightly for easier checks (request from Sebastien). EDIT: Undo-ed that until the 13.0.0 packages land into the editor codebase (see comment below).
• Bumped the universal template to version 13.0.0 to fix the pack jobs.

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Testing status

Ran the nightly pipeline,
Saw that it triggered the templates pipeline,
Saw that the pre-pack step was removed from the templates pipeline.
Canceled the nightly, results are not relevant.
Running the templates pipeline alone to confirm that removing the pre-pack step is not an issue.

[theopnv]

Pipeline is failing because of

 com.unity.render-pipelines.high-definition: Package [com.unity.render-pipelines.high-definition@13.0.0] cannot be found

That's because the 13.0.0 packages have not landed yet in the editor codebase. Unrelated to this PR.