PREQ-8673: Increase legacy build-number migration buffer to 10000

[hedinasr]

PREQ-8673: Increase the v1→v2 migration seed buffer so new claims skip numbers already published to Artifactory.

Why

When no refs/build-number/* exist yet, v2 seeds MAX_CLAIMED from the legacy GitHub build_number property plus a buffer. The buffer was 1000. Repos such as sonarcloud-webapp kept publishing with v1 after that snapshot, so v2 later re-issued numbers Artifactory already had. multiRepoPromote then 500s (Multiple builds found for sonarcloud-webapp#N).

Change

• Seed with legacy + 10000 instead of legacy + 1000.
• Update the shellspec that asserted 42 + 1000 + 1 = 1043 to 10043.

This only affects the first claim in a repo that still has no refs/build-number/*. Repos that already have those refs are unchanged.

Test plan

• shellspec spec/get_build_number_spec.sh --shell bash — 18 examples, 0 failures

[hashicorp-vault-sonar-prod]

PREQ-8673

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues
0 New dependency risks

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[gitar-bot]

Code Review ✅ Approved

🟡 Medium risk

Increases the legacy build-number migration buffer from 1000 to 10000 to prevent v2 from re-issuing numbers already published to Artifactory when repos continue publishing with v1 after the initial snapshot. Shellspec test updated accordingly. No issues found.

Review coverage

Functional validation 1 of 1 objectives covered

Rules No rules evaluated

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Implementation Status ✅ 1 of 1 objectives covered

✅ PREQ-8673 - 1 of 1 objectives covered

This PR covers the objective to increase the legacy build-number migration buffer to 10000.

✅ 1 covered here

• ✅ Increase legacy build-number migration buffer to 10000

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