[Beta] Union bar operator, partition limits, gz header, ray and agent updates

What's Changed

• Add task execution metadata to agent create by @noahjax in #2282
• [flytekitplugins] Rename ChatGPT module to OpenAI module by @Future-Outlier in #2263
• Add support for execution of reference entities by @troychiu in #1808
• Add serial marker to cache related tests by @pingsutw in #2300
• feat: Support pep604 union operator by @ggydush in #2298
• Partition limit by @wild-endeavor in #2301
• Make artifact documentation visible by @neverett in #2302
• remove secrets in sagemaker agent by @samhita-alla in #2308
• Adapt flytekit ray plugin to kuberay 1.1.0 by @ByronHsu in #2274
• Remove post-execute hook from ray task by @yundai424 in #2305
• Gz encoding by @wild-endeavor in #2306
• fix limit option by @novahow in #2292

New Contributors

• @yundai424 made their first contribution in #2305

Full Changelog: v1.12.0b1...v1.12.0b2