feat: sync tests

[He-Pin]

ports:
google/go-jsonnet#849
google/go-jsonnet#853
google/jsonnet#1291
google/jsonnet#1284

[Copilot]

Pull request overview

This PR synchronizes test suites from upstream Google Jsonnet repositories and improves test error reporting. It adds a comprehensive sync script for keeping test suites in sync with upstream, updates error messages for better clarity, fixes YAML parsing behavior for empty/blank input, and enhances the test framework to collect and report all failures at once rather than stopping at the first failure.

Changes:

• Added sync_test_suites.sh script to automate syncing test files from google/jsonnet and google/go-jsonnet repositories
• Enhanced test failure reporting to collect and summarize all failures instead of failing immediately
• Updated std.parseYaml to return null for empty/blank input instead of empty object
• Improved std.flatMap error messages and added new test cases for type checking

Reviewed changes

Copilot reviewed 37 out of 38 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
sync_test_suites.sh	New bash script to sync test suites from upstream repositories, excluding lint/formatter files
refresh_golden_outputs.sh	New script to regenerate golden files using sjsonnet
BaseFileTests.scala (jvm-native)	Added failure collection mechanism and summary reporting for better test diagnostics
BaseFileTests.scala (js)	Added failure collection mechanism and summary reporting for JS platform
FileTests.scala (jvm-native)	Added deep_array_nesting test to skip list and calls to printSummaryAndAssert
FileTests.scala (js)	Added calls to printSummaryAndAssert for consistent test reporting
StdFlatMapTests.scala	Updated test to match improved error message for flatMap on strings
ManifestModule.scala	Changed parseYaml to use isBlank instead of isEmpty for consistency with upstream
ArrayModule.scala	Updated flatMap error messages to be more descriptive
Platform.scala (all platforms)	Changed yamlToJson to return ujson.Null instead of ujson.Obj() for empty input
stdlib.jsonnet	Added regression test for parseYaml with empty input
Various test files	Added new test cases and golden files for flatMap type checking, digit separators, and other features

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