ci: Added testing with latest N4E changes on Prs

[michalChrobot]

Purpose of this PR

We started having a discussion that as we are getting closer to GA we could just run unified-netcode tests with latest landed N4E changes. So this PR follows-up on this and we can discuss this here

Note that I would use 6000.7 editors in that for stability (reason why we don't want to run trunk on our PRs) and the fact that this editor is closer to getting released and we support it anyway

Jira ticket

Will do

Documentation

N/A

Testing & QA (How your changes can be verified during release Playtest)

Will make sure that job works correctly and is green

Up-port

N/A

Backports

N/A

[u-pr]

⚠️ Some settings were ignored in '.pr_agent.toml (repository root)' repo settings

Check the configuration's TOML syntax, permitted settings, and size limit. See the error below.

---

Error message:
Ignored prohibited settings: github_app.handle_pr_actions. Permitted settings were applied.

Configuration content:

# This is the configuration for the u-pr bot
# https://github.cds.internal.unity3d.com/unity/u-pr
# For configuration of this file:
# https://developer.portal.internal.unity.com/catalog/default/component/u-pr/docs/configuration/automatic_runs/

[github_app]
handle_pr_actions = ['opened', 'ready_for_review']  # PR events that auto-run pr_commands
pr_commands       = ["/harness-review"]             # what runs on those events
reviewer_commands = ["/harness-review"]             # what runs when @u-pr is added as reviewer

[u-pr]

💡 Harness Review

The change adds unified playmode testing against N4E trunk to code-change PR checks. I examined the trigger, generated job, manifest resolution, and unified test guards and found no actionable issues.

_{Reviewed commit f464296}

_{🤖 Helpful? 👍/👎}

[codecov-github-com]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@              Coverage Diff               @@
##           develop-3.x.x    #4178   +/-   ##
==============================================
  Coverage          78.19%   78.19%           
==============================================
  Files                153      153           
  Lines              26272    26272           
==============================================
  Hits               20544    20544           
  Misses              5728     5728           

Flag	Coverage Δ
NGOv2_project_testproject_ubuntu	76.64% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
com.unity.netcode.gameobjects	78.19% <ø> (ø)

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