feat: Add compensation workflow pattern to Spring Boot examples

[siri-varma]

Port the BookTrip compensation (Saga) workflow from the plain Java examples into the Spring Boot workflow patterns module, adding @Component-annotated activities and a /wfp/compensation REST endpoint.

Description

Please explain the changes you've made

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1395

#1395

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[Copilot]

Pull request overview

Adds a Spring Boot “compensation / Saga” workflow pattern example (BookTrip) to the workflows/patterns module, along with a REST endpoint to trigger it.

Changes:

• Introduces BookTripWorkflow implementing a simple saga with compensating activities.
• Adds booking and cancellation workflow activities as Spring components.
• Exposes a new POST /wfp/compensation endpoint to run the workflow and return its output.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/CancelHotelActivity.java	Adds hotel-cancellation activity for compensation flow
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/CancelFlightActivity.java	Adds flight-cancellation activity for compensation flow
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/CancelCarActivity.java	Adds car-cancellation activity for compensation flow
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookTripWorkflow.java	Implements saga-style orchestration with compensation retries
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookHotelActivity.java	Adds hotel booking activity used by the workflow
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookFlightActivity.java	Adds flight booking activity used by the workflow
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/compensation/BookCarActivity.java	Adds car booking activity that intentionally fails to trigger compensation
spring-boot-examples/workflows/patterns/src/main/java/io/dapr/springboot/examples/wfp/WorkflowPatternsRestController.java	Adds POST /wfp/compensation endpoint to run the new workflow

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.53%. Comparing base (f63a4a4) to head (80d09f8).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1696   +/-   ##
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  Coverage     79.53%   79.53%           
  Complexity     2193     2193           
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  Files           237      237           
  Lines          6577     6577           
  Branches        730      730           
=========================================
  Hits           5231     5231           
  Misses          990      990           
  Partials        356      356           

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[salaboy]

@siri-varma I am a bit against this way of doing compensations, that's why I've created this example: https://github.com/diagrid-labs/workflow-patterns-spring-boot?tab=readme-ov-file#compensate-on-error-example I think that having an arraylist inside the workflow itself is a hack and should be avoided.

Check this specifically: https://github.com/diagrid-labs/workflow-patterns-spring-boot/blob/main/workflows/src/main/java/io/dapr/springboot/workflows/compensateonerror/CompensateWhenErrorWorkflow.java#L40

Check the example and let me know if you have any questions, I would rather have an example following that approach in the SDK than a port from other languages.

[salaboy]

Check my comment in the PR