Remove ProjectBusy endpoint

[i-oden]

Before submitting this PR

1. Description: In a previous version the DDS set projects to busy when upload or download was ongoing. Now, we have remove that from the CLI, but some users seem to have skipped any upgrades, and therefore some projects are getting stuck in "busy" status which is blocking the project from any actions. This means we sometimes have to manually change the busy status in the database for certain projects when this happens. We need to avoid this issue in the future, we could spend our time on something a lot more useful.
2. Jira task / GitHub issue: DDS-1613
3. How to test: Add information on how someone could manually test this functionality. As detailed as possible.
4. Type of change: Check the relevant boxes in the section below
5. Add docstrings and comments to code, even if you personally think it's obvious.

What type of change(s) does the PR contain?

• New feature
  • Breaking
  • Non-breaking
• Database change
  • Migration included in PR
  • Migration not needed
• Bug fix
  • Breaking: Please describe the reason for the break and how we can fix it.
  • Non-breaking
• Security Alert fix
• Documentation
• Tests (only)
• Workflow

Checklist

• Sprintlog
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• Rebase / Update / Merge from base branch (the branch from which the current is forked)
  • Done
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• Blocking PRs
  • Merged
  • No blocking PRs
• PR to master branch
  • Yes: Read the release instructions
    • I have followed steps 1-8.
  • No

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[codecov]

Codecov Report

Merging #1446 (5fe11c7) into dev (f82c7da) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head 5fe11c7 differs from pull request most recent head f870c30. Consider uploading reports for the commit f870c30 to get more accurate results

@@            Coverage Diff             @@
##              dev    #1446      +/-   ##
==========================================
- Coverage   89.42%   89.39%   -0.04%     
==========================================
  Files          29       29              
  Lines        4314     4298      -16     
==========================================
- Hits         3858     3842      -16     
  Misses        456      456              

Files Changed	Coverage Δ
dds_web/api/project.py	89.76% <100.00%> (-0.35%)	⬇️

[valyo]

Looks good. Tested by checking out v2.1.0 and trying an upload, resulting in error message as intended.