Prevent duplicate PRs to be created

[abelpz]

Describe what your pull request addresses (Please include relevant issue numbers):

Problem:
Issue #1654 reported duplicate PR creations, likely caused by server bottleneck when multiple branch-merger requests are processed simultaneously.

Solution:

• Implemented a queue system to manage branch-merger requests
• Added configurable time interval between PR creation requests
• Prevents request flooding by ensuring sequential processing

Technical Details:

• Requests are now processed sequentially through a queue
• Each request waits for a predefined interval before processing
• Reduces server load and minimizes risk of duplicate PR creation

Testing:
While the original issue couldn't be consistently replicated, this solution addresses the suspected root cause by preventing concurrent PR creation requests.

Related:
Fixes #1654

Please include detailed Test instructions for your pull request:

• No reproduce-able steps given.

Standard Test Instructions for PR Review Process:

• Double check unit tests that have been written
• Check for documentation for code changes
• Is the repo documentation accurate/appropriate?
  • Check Stylguidist if applicable
  • Check readme for correct information about the feature being worked on
• Check that there are not inadvertent commits
• Checkout the branch locally and ensure that app runs as expected
  • Ensure tests pass
  • Open and watch the console for errors
  • Make sure all actions perform as expected
  • Import and Load a new Project
  • Load a tool and perform basic actions
  • Switch tools and perform basic actions
  • Switch project to an existing project
  • Load a tool and perform basic actions
  • Switch tools and perform basic actions
  • Next time reverse the order of importing after loading an existing project
• Reviewer should double check the DoD in the ISSUE, including the “spirit” of the story