[scanner] 🐛 fix: remove duplicate test and unused import blocking nightly release

[clubanderson]

Fixes #18426

Partial fix addressing compilation errors in pkg/api/handlers/missions/ that block the nightly release:

Changes:

• Remove duplicate TestMissions_ShareToSlack_EmptyText function from share_test.go (already defined in share_error_test.go — Go disallows duplicate function names in the same package)
• Remove unused "github.com/gofiber/fiber/v2" import from share_test.go

These two issues cause the entire missions test package to fail compilation, which cascades to fail:

• TestMissions_BrowseConsoleKB_EmbeddedFallback
• TestMissions_GetMissionFile_EmbeddedFallback
• TestGetKBScores_UpstreamError

Remaining nightly failures (separate root causes, tracked in #18426 comments):

• AI provider tests (Claude, Codex, Gemini) — separate package
• KC-Agent URL normalization — separate package
• Import cycle in pkg/k8s/gpu — requires architectural decision

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[github-actions]

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Pull request overview

This PR removes Go test compilation blockers in pkg/api/handlers/missions by eliminating a duplicate test function and an unused import, unblocking the missions test package so the nightly release pipeline can proceed.

Changes:

• Removed the duplicate TestMissions_ShareToSlack_EmptyText from share_test.go (confirmed it already exists in share_error_test.go).
• Removed an unused github.com/gofiber/fiber/v2 import from share_test.go.

[github-actions]

Thank you for your contribution! Your PR has been merged.

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[github-actions]

Post-merge build verification passed ✅

Both Go and frontend builds compiled successfully against merge commit a5bb6cd00100de805d47c799946a0c3c573056d0.

[github-actions]

✅ Post-Merge Verification: passed

Commit: a5bb6cd00100de805d47c799946a0c3c573056d0
Specs run: smoke.spec.ts
Report: https://github.com/kubestellar/console/actions/runs/27857813783