ci: update release scripts to prevent tag overrides

[wrn14897]

Ref: HDX-1976

1. Updated release-xxx commands to prevent image tag overrides
2. Updated release workflow so that notify-xxx steps won't be triggered if no new app image was pushed

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Latest commit: 03af2e5

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Name	Status	Preview	Comments	Updated (UTC)
hyperdx-v2-oss-app	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 8, 2025 5:16pm

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[teeohhem]

HDX-1976