fix: SITES-41401 Add isSummitPlgEnabled to sites-resolve API response

[sandsinh]

Summary

Adds isSummitPlgEnabled to the sites-resolve API response in spacecat-api-service so callers can see whether the Summit plugin is enabled for each site.

Changes

Sites-resolve response now includes an isSummitPlgEnabled field.
Enables clients to branch on Summit plugin availability without extra lookups.

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Related Issues

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[github-actions]

This PR will trigger a patch release when merged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[ssilare-adobe]

Great work @sandsinh , here are few review comments.

[ssilare-adobe]

LGTM 🚀

[solaris007]

🎉 This PR is included in version 1.340.1 🎉

The release is available on GitHub release

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