updating doc to use DE from existing installation

[nithyatsu]

Description

deployment-engine is currently a private repo. Updating contributor docs to use DE from existing installation.

Type of change

• This pull request is a minor refactor, code cleanup, test improvement, or other maintenance task and doesn't change the functionality of Radius (issue link optional).

[rynowak]

Can we leave this here? It's still useful.

That gives users the choice of either:

• Using the DE from a cluster
• Using the DE from local source code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.11%. Comparing base (2df79ec) to head (053fc7a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7964      +/-   ##
==========================================
- Coverage   61.13%   61.11%   -0.02%     
==========================================
  Files         533      533              
  Lines       28248    28248              
==========================================
- Hits        17269    17265       -4     
- Misses       9462     9464       +2     
- Partials     1517     1519       +2     

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[radius-functional-tests]

Radius functional test overview

🔍 Go to test action run

Name	Value
Repository	nithyatsu/radius
Commit ref	053fc7a
Unique ID	func1aa52fd8f9
Image tag	pr-func1aa52fd8f9

Click here to see the list of tools in the current test run

• gotestsum 1.12.0
• KinD: v0.20.0
• Dapr: 1.12.0
• Azure KeyVault CSI driver: 1.4.2
• Azure Workload identity webhook: 1.3.0
• Bicep recipe location ghcr.io/radius-project/dev/test/testrecipes/test-bicep-recipes/<name>:pr-func1aa52fd8f9
• Terraform recipe location http://tf-module-server.radius-test-tf-module-server.svc.cluster.local/<name>.zip (in cluster)
• applications-rp test image location: ghcr.io/radius-project/dev/applications-rp:pr-func1aa52fd8f9
• controller test image location: ghcr.io/radius-project/dev/controller:pr-func1aa52fd8f9
• ucp test image location: ghcr.io/radius-project/dev/ucpd:pr-func1aa52fd8f9
• deployment-engine test image location: ghcr.io/radius-project/deployment-engine:latest

Test Status

⌛ Building Radius and pushing container images for functional tests...
✅ Container images build succeeded
⌛ Publishing Bicep Recipes for functional tests...
✅ Recipe publishing succeeded
⌛ Starting ucp-cloud functional tests...
⌛ Starting corerp-cloud functional tests...
⌛ Starting datastoresrp-cloud functional tests...
✅ ucp-cloud functional tests succeeded
✅ datastoresrp-cloud functional tests succeeded
✅ corerp-cloud functional tests succeeded