feat(remove): add remove command to remove a service from azure.yaml

[jongio]

What

Adds azd app remove <service>, the inverse of azd app add. It deletes the named service from the services section of azure.yaml and leaves every other service and top-level key untouched.

Why

add writes a service into azure.yaml but there was no matching command to take one back out. Undoing an add meant hand-editing YAML and finding the right entry. This closes that gap so the add/remove pair is symmetric.

Behavior

• azd app remove redis deletes the redis entry and preserves the rest of the file
• Removing a service that is not present fails with a clear error listing the current service names
• No-op removals leave the file byte-for-byte unchanged
• Supports the global --output json flag

Tests

Table-driven unit tests cover a successful removal (with sibling and top-level preservation), an unknown service, a missing services section, the not-found message, JSON result shape, and the no-argument error.

Closes #506

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.72%. Comparing base (37e07e7) to head (0109a36).

Files with missing lines	Patch %	Lines
cli/src/cmd/app/commands/remove.go	42.85%	42 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #511      +/-   ##
==========================================
- Coverage   60.77%   60.72%   -0.06%     
==========================================
  Files         223      224       +1     
  Lines       28527    28611      +84     
==========================================
+ Hits        17337    17373      +36     
- Misses      10010    10052      +42     
- Partials     1180     1186       +6     

Flag	Coverage Δ
unittests	60.72% <42.85%> (-0.06%)	⬇️

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/remove.go	42.85% <42.85%> (ø)

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[github-actions]

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Build Info:

• Version: 0.19.5-pr511
• Commit: 0109a36
• Release: View pre-release

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