[FLINK-39310][web-ui] Use programArgsList in JSON body instead of program-args query parameter

[daguimu]

Problem

The Web UI's jar.service.ts uses the deprecated program-args query parameter (string) instead of the Flink 2.0 REST API's programArgsList (string array) in the JSON request body. This causes JAR submission with program arguments to fail on Flink 2.0+ — arguments are silently ignored or rejected because the server expects programArgsList in the request body.

Additionally, there was a pre-existing bug where the savepointPath query parameter was incorrectly set to the programArgs value instead of the actual savepointPath.

Root Cause

Both runJob() and getPlan() methods were sending parameters via HTTP query parameters with incorrect names (program-args, entry-class) instead of using JSON request body fields with the correct names expected by JarRunRequestBody/JarRequestBody (programArgsList, entryClass, etc.).

Fix

Updated both runJob() and getPlan() in jar.service.ts to:

• Send parameters via JSON request body with field names matching the server-side JarRunRequestBody/JarRequestBody classes: entryClass, programArgsList, parallelism, savepointPath, allowNonRestoredState
• Parse program arguments from a single input string into a string[] (programArgsList) with proper handling of single and double quoted arguments
• Switch getPlan() from GET to POST with JSON body (both are supported by the server, POST is recommended per API docs)
• Fix savepointPath bug where the query param value was incorrectly set to programArgs
• Correct types: send parallelism as integer and allowNonRestoredState as boolean to match server-side expectations

Tests

The Flink web-dashboard Angular project has skipTests: true configured globally and no test framework (no Karma/Jest config, no .spec.ts files). Therefore:

• Verified TypeScript compilation passes (tsc --noEmit)
• Verified ESLint passes
• Performed 3-round manual code review verifying field names match JarRequestBody.java and JarRunRequestBody.java
• Existing Java-side tests (JarRunHandlerParameterTest, JarPlanHandlerParameterTest, JarHandlerUtilsTest) already validate the REST API handling of programArgsList

Impact

• Only affects jar.service.ts in the web-dashboard
• Fixes JAR submission with program arguments on Flink 2.0+
• Fixes the savepointPath bug that was silently breaking savepoint restore on job submission
• No breaking changes — the server already accepts the JSON body format

Fixes FLINK-39310

[flinkbot]

CI report:

• 86f7d53 Azure: SUCCESS

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