[Admin] component instance variables

[elia]

Summary

• See [Admin] Tweaks for the product listing #5176
• Based on [Admin] add batch actions to the products/index component #5180 (just check the last commit)

Checklist

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[waiting-for-dev]

@elia, it looks there's a problem on CI

[codecov]

Codecov Report

Merging #5254 (778466e) into nebulab/admin (778466e) will not change coverage.
The diff coverage is n/a.

❗ Current head 778466e differs from pull request most recent head 16ead9f. Consider uploading reports for the commit 16ead9f to get more accurate results

@@              Coverage Diff               @@
##           nebulab/admin    #5254   +/-   ##
==============================================
  Coverage          88.46%   88.46%           
==============================================
  Files                596      596           
  Lines              14503    14503           
==============================================
  Hits               12830    12830           
  Misses              1673     1673           

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[waiting-for-dev]

Thanks!