Add lora cloud banner

[ryaplots]

Summary

References https://github.com/TheThingsIndustries/lorawan-stack/issues/4597

Changes

• Add warning banner

Testing

Steps

1. Go to lora cloud integration page and see the banner

Results

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• Testing: The steps/process to test this feature are clearly explained including testing for regressions.
• Infrastructure: If infrastructural changes (e.g., new RPC, configuration) are needed, a separate issue is created in the infrastructural repositories.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.

[KrishnaIyer]

Nice. Here's the text

Effective July 31, 2025, all LoRa Cloud™ services will transition to Semtech's partner network. This integration will no longer be supported after this date.