Skip body building when HTTP call body is absent

[mcruzdev]

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What this PR does / why we need it:

Special notes for reviewers:

Additional information (if needed):

Closes #1648

[Copilot]

🟡 Changes recommended

The code change affects POST/PUT/PATCH but test coverage was only added for POST, leaving PUT/PATCH no-body behavior unverified.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Fixes HTTP call handling so POST/PUT/PATCH workflows without with.body no longer throw an IllegalArgumentException, aligning behavior with the Serverless Workflow HTTP call spec.

Changes:

• Skip creating a body-based request executor when the HTTP call body is absent for POST/PUT/PATCH.
• Add a workflow sample that performs an HTTP POST without a body.
• Add a regression test asserting that a POST without with.body does not throw and sends an empty request body.

File summaries

File	Description
impl/http/src/main/java/io/serverlessworkflow/impl/executors/http/HttpExecutorBuilder.java	Selects a no-body request executor for POST/PUT/PATCH when body is null.
impl/test/src/test/java/io/serverlessworkflow/impl/test/HTTPWorkflowDefinitionTest.java	Adds a regression test for POST calls without with.body.
impl/test/src/test/resources/workflows-samples/call-http-post-no-body.yaml	Adds a minimal workflow sample for POST without a body.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 1
• Review effort level: Lite

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