feat(graph): add services-only filter

[jongio]

Adds azd app graph --services-only to omit resource nodes from graph output and keep only service-to-service edges.

Validation:

• go build ./...
• go test ./...

Closes #559

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.20%. Comparing base (5e8b8ba) to head (8c9d332).

Files with missing lines	Patch %	Lines
cli/src/cmd/app/commands/graph.go	94.44%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #562      +/-   ##
==========================================
+ Coverage   61.14%   61.20%   +0.05%     
==========================================
  Files         224      224              
  Lines       28989    29024      +35     
==========================================
+ Hits        17726    17764      +38     
+ Misses      10065    10061       -4     
- Partials     1198     1199       +1     

Flag	Coverage Δ
unittests	61.20% <94.44%> (+0.05%)	⬆️

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/graph.go	86.25% <94.44%> (+0.91%)	⬆️

... and 1 file with indirect coverage changes

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[github-actions]

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Bash (macOS/Linux):

curl -fsSL https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/install-pr.sh | bash -s 562 0.20.0-pr562

Uninstall

When you're done testing:

PowerShell (Windows):

iex "& { $(irm https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/uninstall-pr.ps1) } -PrNumber 562"

Bash (macOS/Linux):

curl -fsSL https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/uninstall-pr.sh | bash -s 562

---

Build Info:

• Version: 0.20.0-pr562
• Commit: 8c9d332
• Release: View pre-release

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