refactor: Remove dead project routing

[Ma77Ball]

What changes were proposed in this PR?

• Removed the project and project/:pid route definitions from app-routing.module.ts, along with the now-unused UserProjectComponent and UserProjectSectionComponent imports there.
• Removed the type === "project" arm from ListItemComponent.initializeEntry and dropped its now-unused DASHBOARD_USER_PROJECT import.

Any related issues, documentation, or discussions?

Closes: #5172

How was this PR tested?

• Ran yarn format:fix (clean, 514 files unchanged).
• Verified via grep that no project route or DASHBOARD_USER_PROJECT references remain in the two edited files.
• The referenced list-item.component.spec.ts project routing test case was already absent, so no spec change was needed.

Was this PR authored or co-authored using generative AI tooling?

Co-authored with Claude Opus 4.7 in compliance with ASF

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.95%. Comparing base (eb287f3) to head (db843e3).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5309      +/-   ##
============================================
- Coverage     49.97%   49.95%   -0.02%     
  Complexity     2421     2421              
============================================
  Files          1052     1052              
  Lines         40780    40777       -3     
  Branches       4356     4355       -1     
============================================
- Hits          20378    20369       -9     
- Misses        19193    19196       +3     
- Partials       1209     1212       +3     

Flag	Coverage Δ		*Carryforward flag
access-control-service	41.89% <ø> (ø)		Carriedforward from eb287f3
agent-service	33.76% <ø> (ø)		Carriedforward from eb287f3
amber	52.01% <ø> (ø)		Carriedforward from eb287f3
computing-unit-managing-service	1.38% <ø> (ø)		Carriedforward from eb287f3
config-service	54.68% <ø> (ø)		Carriedforward from eb287f3
file-service	38.42% <ø> (ø)		Carriedforward from eb287f3
frontend	42.40% <ø> (-0.03%)	⬇️
pyamber	90.80% <ø> (ø)		Carriedforward from eb287f3
python	90.80% <ø> (ø)		Carriedforward from eb287f3
workflow-compiling-service	58.39% <ø> (ø)		Carriedforward from eb287f3

*This pull request uses carry forward flags. Click here to find out more.

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[Ma77Ball]

/request-review @Xiao-zhen-Liu

[Yicong-Huang]

hmm, I thought we agreed to hold off on the issue. were there any updates on the decision?

[Ma77Ball]

@Yicong-Huang Yes, the plan currently is to avoid removing project routing until a formal decision is made. I wanted this to be a draft pr, but I did not see this option when opening this pr.