fix: use small delay before posting branch status to gitlab (#8759)

[bobvandevijver]

Changes:

This PR adds a small delay before calling the Gitlab API to add a branch status.

Context:

This should hopefully fix the race condition as described in #8759

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• Newly added unit tests, or
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[viceice]

I think the `delay' needs to be mocked in tests to not slow down

[bobvandevijver]

Correct me if I'm wrong, but I think that is already done here, probably for the other delay that was already in the changed file:

renovate/lib/platform/gitlab/index.spec.ts

Line 28 in eb8ca67

jest.mock('delay');

[renovate-release]

🎉 This PR is included in version 24.59.1 🎉

The release is available on:

• GitHub release
• 24.59.1

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