Fixed contribution queue not being deleted (1.4.x)

[NejcZdovc]

Resolves brave/brave-browser#7579

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone
• Public documentation has been updated as necessary. For instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protection-Mode
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-compatibility-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on.
• All relevant documentation has been updated.

[kjozwiak]

Restarting macOS due to both https://ci.brave.com/job/brave-browser-build-pr/job/contribution-queue-1.4/1/execution/node/706/log/ & https://ci.brave.com/job/brave-browser-build-pr/job/contribution-queue-1.4/1/execution/node/389/log/ failing.

[kjozwiak]

Restarting macOS due to https://ci.brave.com/job/brave-browser-build-pr/job/contribution-queue-1.4/2/execution/node/331/log/ failing.

[kjozwiak]

Looks like it failed again in the same spot on macOS as per https://ci.brave.com/job/brave-browser-build-pr/job/contribution-queue-1.4/4/execution/node/331/log/:

22:27:36  Operation completed over 22 objects/138.4 MiB.                                   
22:28:27  Error: Command 'git ls-tree HEAD third_party/libgifcodec' returned non-zero exit status 128 in /Users/jenkins/jenkins/workspace/_build-pr_contribution-queue-1.4/src
22:28:27  error: object directory /Users/jenkins/cache/chromium.googlesource.com-chromium-src/objects does not exist; check .git/objects/info/alternates.
22:28:27  fatal: not a tree object

Going to restart once more.

[kjozwiak]

Uplift into 1.4.x approved after deliberating with @brave/uplift-approvers. Both CI/Jenkins and CI/Travis passed after several restarts on macOS. Please make sure that all the correct labels are being used and the associated issue is moved into the correct milestone.