Allow selecting same frequency plan multiple times for gateway registration

[PavelJankoski]

Summary

References #8041

Changes

• Allow selecting same frequency plans and not only distinct options on the gateway registration form.

Testing

Steps

1. Login to console.
2. Go to Gateways tab.
3. Click register gateway button.
4. Try to select multiple same frequency plans.
5. Submit form.

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.

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused implementation preserves same-band filtering and includes end-to-end regression coverage.

Review effort: Balanced
Findings: None

What changed in this PR

Allows duplicate gateway frequency plans while retaining same-band filtering.

Changes:

• Separates same-band filtering from distinct-option filtering.
• Enables duplicate plans in gateway registration and settings.
• Adds Cypress coverage and a changelog entry.

File	Description
pkg/​webui/​jsconfig.json	Enables React JSX tooling.
pkg/​webui/​console/​containers/​freq-plans-select/​gs-frequency-plan-select.js	Permits duplicate plans.
pkg/​webui/​components/​key-value-map/​entry.js	Preserves tag filtering independently.
cypress/​e2e/​console/​gateways/​edit.spec.js	Tests duplicate plan persistence.
CHANGELOG.md	Documents the fix.

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