Change ScheduledJobParameter to an abstract class and create re-usable methods for subclasses

[cwperks]

Description

This PR contains 2 primary changes:

• Updates the TransportGetScheduledInfoAction to re-use marshaling logic from other classes that it uses to produce the API response for list jobs API
• Change ScheduledJobParameter from an interface to an extensible class

Note: The change to ScheduledJobParameter is breaking for plugins that extend the job scheduler, but it does provide benefits to remove code duplication. Many plugins that implement this interface copy the same boiler plate code and having a superclass with common methods would remove the boilerplate.

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[codecov]

Codecov Report

❌ Patch coverage is 65.38462% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.36%. Comparing base (a65cf07) to head (8a18004).

Files with missing lines	Patch %	Lines
...arch/jobscheduler/scheduler/JobSchedulingInfo.java	57.14%	15 Missing ⚠️
...bscheduler/sampleextension/SampleJobParameter.java	38.46%	8 Missing ⚠️
...r/transport/response/GetScheduledInfoResponse.java	81.48%	4 Missing and 1 partial ⚠️
...arch/jobscheduler/model/ExtensionJobParameter.java	42.85%	4 Missing ⚠️
...ler/transport/request/GetScheduledInfoRequest.java	33.33%	2 Missing ⚠️
...ensearch/jobscheduler/utils/JobDetailsService.java	0.00%	2 Missing ⚠️

❌ Your project check has failed because the head coverage (68.36%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #813      +/-   ##
==========================================
- Coverage   69.80%   68.36%   -1.45%     
==========================================
  Files          38       36       -2     
  Lines        1729     1612     -117     
  Branches      156      132      -24     
==========================================
- Hits         1207     1102     -105     
- Misses        431      440       +9     
+ Partials       91       70      -21     

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