fix(sdk): use local wheels for regression tests

[rishabh998186]

Description

This PR resolves the "Missing distribution found" error that occurs during release version bumps (e.g., to 2.16.0) when kfp-server-api has not yet been published to PyPI.

Root Cause

The TestDockerRunner tests previously used a git URL for KFP_PACKAGE_PATH. When component containers ran, pip tried to resolve the new version of kfp-server-api from PyPI and failed.

fix

• Updated test/presubmit-tests-sdk.sh to build a local kfp wheel and set KFP_PACKAGE_PATH to the local path.
• Updated all SDK test scripts ( presubmit-tests-sdk.sh, presubmit-tests-sdk-unit.sh, presubmit-tests-sdk-client.sh) to pre-install kfp-server-api from local source (backend/api/v2beta1/python_http_client).
• This ensures pip satisfies dependency constraints using local artifacts instead of hitting PyPI.
• Shortened internal comments for better scannability.

fixes #12906

[google-oss-prow]

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[github-actions]

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[google-oss-prow]

Hi @rishabh998186. Thanks for your PR.

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[Copilot]

Pull request overview

This PR fixes a CI failure that occurs during version bumps when the KFP SDK references a version of kfp-server-api that hasn't been published to PyPI yet. The issue manifested in regression tests that use Docker containers, where pip would fail to resolve the unreleased kfp-server-api dependency.

Changes:

• Build and use local kfp wheel for regression tests instead of git URL to avoid PyPI dependency resolution
• Pre-install kfp-server-api from local source in all SDK test scripts before installing the main SDK package
• Add python build module to test dependencies

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
test/presubmit-tests-sdk.sh	Added build module installation, local kfp-server-api installation, and local wheel building logic to replace git URL-based KFP_PACKAGE_PATH
test/presubmit-tests-sdk-unit.sh	Added local kfp-server-api installation before SDK installation
test/presubmit-tests-sdk-client.sh	Added local kfp-server-api installation before SDK installation

[rishabh998186]

@droctothorpe ,
Could you please look at my pr when you get a chance.