fix(deploy): elevate to Administrator on force fail

[siduck]

The earlier fix broke because it ran as the regular user, who isn't allowed to touch Agent Job records, so cancelling silently failed every time. Now it runs as admin for just that step

[greptile-apps]

Confidence Score: 5/5

Safe to merge; the previous test-coverage finding is fully fixed.

_{Reviews (3) · Last reviewed commit: "Merge branch 'develop' into fix-ui"}

[greptile-apps]

Regression Coverage Missing
This bug fix adds Administrator impersonation and restoration without a regression test. The repository requires every bug fix to have coverage, so add a test proving force-fail cancels builds as Administrator and restores the original user after both success and exceptions before merging.

Context Used: Guidelines for reviewing Frappe Framework applications. (source)

Prompt To Fix With AI

This is a comment left during a code review.
Path: press/press/doctype/release_pipeline/release_pipeline.py
Line: 235-240

Comment:
**Regression Coverage Missing**
This bug fix adds Administrator impersonation and restoration without a regression test. The repository requires every bug fix to have coverage, so add a test proving force-fail cancels builds as Administrator and restores the original user after both success and exceptions before merging.

**Context Used:** Guidelines for reviewing Frappe Framework applications. ([source](https://github.com/frappe/skills/blob/main/skills/quality-code-review/SKILL.md))

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.82609% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 62.07%. Comparing base (07485b0) to head (d220ef1).
⚠️ Report is 24 commits behind head on develop.

Files with missing lines	Patch %	Lines
...press/doctype/release_pipeline/release_pipeline.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7456      +/-   ##
===========================================
+ Coverage    61.94%   62.07%   +0.13%     
===========================================
  Files         1067     1067              
  Lines       102449   102679     +230     
  Branches      1777     1777              
===========================================
+ Hits         63460    63738     +278     
+ Misses       38944    38896      -48     
  Partials        45       45              

Flag	Coverage Δ
dashboard	85.94% <ø> (ø)

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