feat(clean): add older-than artifact filter

[jongio]

Adds azd app clean --older-than <duration> so cleanup can skip fresh build output and only target stale artifacts.

Validation:

• go test .\src\cmd\app\commands

Closes #530

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 78.94737% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.77%. Comparing base (32a2270) to head (f53398b).

Files with missing lines	Patch %	Lines
cli/src/cmd/app/commands/clean.go	78.94%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #533   +/-   ##
=======================================
  Coverage   60.77%   60.77%           
=======================================
  Files         223      223           
  Lines       28527    28546   +19     
=======================================
+ Hits        17337    17350   +13     
- Misses      10010    10015    +5     
- Partials     1180     1181    +1     

Flag	Coverage Δ
unittests	60.77% <78.94%> (+<0.01%)	⬆️

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

Files with missing lines	Coverage Δ
cli/src/cmd/app/commands/clean.go	75.00% <78.94%> (+0.43%)	⬆️

... and 1 file with indirect coverage changes

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[github-actions]

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Build Info:

• Version: 0.19.5-pr533
• Commit: f53398b
• Release: View pre-release

What to Test:
Please review the PR description and test the changes described there.