CLI-800 Introduce sonar update, deprecate sonar self-update

[kirill-knize-sonarsource]

---

Summary by Gitar

• CLI Command Update:
  • Introduced sonar update command to replace sonar self-update.
  • Deprecated sonar self-update by marking it as hidden and adding a pre-action deprecation warning.
• Documentation & Tests:
  • Updated CLAUDE.md to reflect command deprecation and added the SonarQube Agentic Analysis protocol.
  • Added integration tests for sonar update and verified the deprecation warning for sonar self-update.
  • Updated various system diagnostic and notification strings across src/ and unit/integration tests to reference sonar update.

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[hashicorp-vault-sonar-prod]

CLI-800

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues
0 New dependency risks

Measures
0 Security Hotspots
89.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[gitar-bot]

Code Review ✅ Approved

Introduces the sonar update command and deprecates sonar self-update with a warning notice. Updates corresponding documentation and test suites to reflect the command migration.

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