feat(backend): double input size limit. Fixes #12510

[neo99zhang]

Description of your changes:
This PR increases the maximum parameter size limit from 10KB to 20KB by doubling MaxParameterBytes from
10000 to 20000.

Motivation

Fixes #2286, fixes #4828, fixes #12510

Users need to pass larger parameter values to their pipelines. The current 10KB limit is too restrictive
for complex parameter configurations.

Test Results:

✅ Parameter validation tests - PASSED (2/2)

• TestValidatePipelineSpecAndResourceReferences_ParameterTooLongWithPipelineId
• TestValidatePipelineSpecAndResourceReferences_ParameterTooLongWithWorkflowManifest

✅ Util package tests - PASSED (all 59 tests)

✅ Apiserver package tests - PASSED (all 385 tests)

✅ Backend build - SUCCESS

Checklist:

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@HumairAK @chensun Thanks for your time and attention

[google-oss-prow]

Hi @neo99zhang. Thanks for your PR.

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[chensun]

/lgtm

[chensun]

/ok-to-test

[google-oss-prow]

New changes are detected. LGTM label has been removed.

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[hbelmiro]

/ok-to-test

[hbelmiro]

/retest