2.7.3: Security enhancements and bug fixes

What's Changed

• [2.7] Fix auth test: remove signature.json from expected ls output (non-CC participants no longer sign root after #4318) by @YuanTingHsieh in #4347
• [2.7] Cherry-pick of Fix ci torch version issue (#4391) by @YuanTingHsieh in #4402
• [2.7] Restrict remote log configuration and local listeners by @pcnudde in #5204
• [2.7] Surface client job log configuration failures by @chesterxgchen in #5205
• [2.7] Handle configure job log with no connected clients by @chesterxgchen in #5218

Full Changelog: 2.7.2...2.7.3