Move GHSA notification logic outside recursion

[antoinbo]

Description

Fix GitHub Advisory Mirroring task triggering too many notifications.

Addressed Issue

4400

Additional Details

N/A

Checklist

• [X] I have read and understand the contributing guidelines
• [x] This PR fixes a defect, and I have provided tests to verify that the fix is effective
• ~This PR implements an enhancement, and I have provided tests to verify that it works as intended~
• ~This PR introduces changes to the database model, and I have added corresponding update logic~
• ~This PR introduces new or alters existing behavior, and I have updated the documentation accordingly~

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.01% (target: -1.00%)	:x: 0.00% (target: 70.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (ea002e97163b32ad3f8cac6a9c45254819752c44) | 22581 | 17875 | 79.16% | | | Head commit (1fa388a4545a27213fab7962e0dee003ddab5f7a) | 22589 (+8) | 17883 (+8) | 79.17% (**+0.01%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#4401) | 13 | 0 | **0.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[nscuro]

Thanks @antoinbo! Could you please sign-off your commit so that the DCO check succeeds? You can find instructions how to do that by clicking on the Details link next to the failing check.