chore: add toggle for enabling/disabling PR pipelines in Jenkinsfile [WPB-21880]

[MohamadJaara]

https://wearezeta.atlassian.net/browse/WPB-21880

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Issues

the jenkins run for PRs right now is not working and it is better to stop it since it will soon be replaced

Solutions

Briefly describe the solutions you have implemented for the issues explained above.

Dependencies (Optional)

If there are some other pull requests related to this one (e.g. new releases of frameworks), specify them here.

Needs releases with:

• GitHub link to other pull request

Testing

Test Coverage (Optional)

• I have added automated test to this contribution

How to Test

Briefly describe how this change was tested and if applicable the exact steps taken to verify that it works as expected.

Notes (Optional)

Specify here any other facts that you think are important for this issue.

Attachments (Optional)

Attachments like images, videos, etc. (drag and drop in the text box)

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PR Post Submission Checklist for internal contributors (Optional)

• Wire's Github Workflow has automatically linked the PR to a JIRA issue

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PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.46%. Comparing base (2d0e494) to head (60ed4fa).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4571   +/-   ##
========================================
  Coverage    48.46%   48.46%           
========================================
  Files          575      575           
  Lines        19825    19825           
  Branches      3315     3315           
========================================
  Hits          9608     9608           
  Misses        9202     9202           
  Partials      1015     1015           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud