docs(protocol-designer): update release process for parallel staging

[y3rsh]

Overview

• protocol-designer: Refresh protocol-designer/RELEASE.md so PD release steps match CI: add a Builds and deployments section (source of truth: .github/workflows/pd-test-build-deploy.yaml), document pd-test* tags (not branches) for sandbox deploys at https://sandbox.designer.opentrons.com/{full tag name}, clarify that only staging and production tagged deploys need PD release approval in Actions, describe alphas via pd-test* → staging via staging-protocol-designer@* → production via protocol-designer@*, and state that pd-test* tag names must not contain @ (those tags become the URL path; @ remains correct on staging and production tags only).
• CI: Align the PD workflow with that process: pd-test* on push.tags, and remove pd-test* from push.branches so sandbox alphas are tag-driven.
• Tests: Add coverage in scripts/static-deploy for pd-test* tag resolution (sandbox + full tag as prefix).

Test Plan and Hands on Testing

• Skim protocol-designer/RELEASE.md for accuracy, links, and consistency with the workflow.
• Confirm .github/workflows/pd-test-build-deploy.yaml triggers match the doc (branches vs tags for pd-test*).

Changelog

• Internal: PD release documentation, PD deploy workflow triggers for pd-test* sandbox tags, and a small static-deploy test; no user-facing product or API changes.

Risk assessment

• Attention level: Low to medium (small workflow change affects what ref types deploy to sandbox).
• Blast radius: PD sandbox deploy behavior only for pd-test* (branch pushes no longer deploy under that pattern); staging and production unchanged. Documentation errors could still mislead releasers.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.38%. Comparing base (a231edc) to head (8befd7e).
⚠️ Report is 7 commits behind head on edge.

Additional details and impacted files

@@            Coverage Diff             @@
##             edge   #21145      +/-   ##
==========================================
+ Coverage   57.37%   57.38%   +0.01%     
==========================================
  Files        3922     3922              
  Lines      321782   321700      -82     
  Branches    46366    46366              
==========================================
- Hits       184630   184616      -14     
+ Misses     136929   136861      -68     
  Partials      223      223              

Flag	Coverage Δ
app	45.16% <ø> (+<0.01%)	⬆️
protocol-designer	19.96% <ø> (ø)

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see 8 files with indirect coverage changes

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[jerader]

left some comments!

[jerader]

copy looks good to me, thanks!