chore: switch presubmit to use gotestsum

[shollyman]

This PR migrates presubmit tests to run using gotestsum, and stops the use of go-junit-report to parse logs.

related: b/473558736

[gemini-code-assist]

Summary of Changes

Hello @shollyman, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the presubmit test execution script to leverage gotestsum. This change streamlines the process of running Go tests and generating JUnit XML reports, eliminating the need for a separate log parsing step. The primary goal is to modernize and simplify the test infrastructure, making the test output more readable and report generation more efficient.

Highlights

• Migration to gotestsum: The presubmit tests have been updated to use gotestsum for running Go tests, replacing the direct go test command.
• Removal of go-junit-report: The separate go-junit-report utility is no longer needed, as gotestsum now directly handles the generation of JUnit XML reports.
• Streamlined Test Execution: The overall process for executing tests and generating reports in presubmit.sh has been simplified by consolidating steps into gotestsum.
• Increased Test Timeout: The timeout for short tests has been adjusted from 15 minutes to 45 minutes to accommodate potential longer run times with the new setup.

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[gemini-code-assist]

Code Review

This pull request migrates the presubmit tests from go test | go-junit-report to gotestsum. The change is straightforward and achieves the goal. I've found one area for improvement regarding code duplication and a potential bug with a test timeout value, for which I've provided a suggestion. Otherwise, the changes look good.