v1.2.beta3

What's Changed

• Update NeMo dataset link in USER_GUIDE.md by @TaekyungHeo in #370
• Add .github/CODEOWNERS by @TaekyungHeo in #371
• Merge test definition and test templates under workloads by @amaslenn in #374
• Use custom script for NemoRun jobs by @amaslenn in #372
• Allow uint8 in NCCL ALLtoALL by @srivatsankrishnan in #376
• Allow unknown fields for cmd_args in test definitions by @amaslenn in #373
• Remove unused code from SlurmSystem by @amaslenn in #378

Full Changelog: v1.2.beta2...v1.2.beta3