feat: Add view published button in page preview/edit mode

[NarenderRajuB]

Description

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Checklist

• [ ] I have opened this pull request against master
• [ ] I have added or modified the tests when changing logic
• [ ] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [ ] I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.

[codecov[bot]]

Codecov Report

Merging #281 (3a40215) into master (0ba20b4) will decrease coverage by 0.29%. The diff coverage is 63.15%.

@@            Coverage Diff             @@
##           master     #281      +/-   ##
==========================================
- Coverage   87.30%   87.00%   -0.30%     
==========================================
  Files          29       29              
  Lines        1536     1555      +19     
  Branches      249      253       +4     
==========================================
+ Hits         1341     1353      +12     
- Misses        140      146       +6     
- Partials       55       56       +1     

Impacted Files	Coverage Δ
djangocms_versioning/cms_toolbars.py	90.78% <63.15%> (-4.31%)	:arrow_down:

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[Aiky30]

Ported the changes to here: https://github.com/django-cms/djangocms-versioning/pull/282

Thanks for your help with this Naren.