RI-7799: Fix download report for electron

[pawelangelow]

What

Everything worked until it was bundled in Electron.

---

Note

Enable bulk action report download in Electron by exposing Content-Disposition header server-side and fetching with window ID client-side to derive filename and trigger blob download.

• Backend (API):
  • Update BulkActionsService.streamReport to set Access-Control-Expose-Headers: Content-Disposition for downloadable reports in redisinsight/api/src/modules/bulk-actions/bulk-actions.service.ts.
• Frontend (UI):
  • Rewrite triggerDownloadFromUrl in redisinsight/ui/src/utils/dom/triggerDownloadFromUrl.ts to use fetch with CustomHeaders.WindowId when available, parse Content-Disposition for filename, and download via blob URL.
• Tests:
  • Extend bulk-actions.service.spec.ts to assert the new Access-Control-Expose-Headers header.

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[github-actions]

Code Coverage - Frontend unit tests

St.❔	Category	Percentage	Covered / Total
🟢	Statements	82.84%	21020/25373
🟡	Branches	68.01%	8846/13007
🟡	Functions	78.03%	5756/7377
🟢	Lines	83.25%	20586/24728

Test suite run success

5468 tests passing in 703 suites.

Report generated by 🧪jest coverage report action from da92494

[cursor]

Bug: Blob URL revoked immediately may fail download

The URL.revokeObjectURL(blobUrl) is called synchronously right after link.click(). However, click() only initiates the download and returns immediately - it doesn't wait for the download to complete or even start. In some browsers or environments (including Electron, which this PR specifically targets), the blob URL may be revoked before the browser has finished reading the blob data, causing the download to fail silently. A common solution is to delay the revocation using setTimeout or defer it until after a brief period.