ci: update sonar project key to use environment variable

[NelsonBN]

Checklist before requesting a review

• I have performed a self-review of my code.
• Implemented tests for new features.
• I tested the features already implemented.
• Added usage examples in the readme.

[github-actions]

🚀 Stryker report generated 🚀

To more details: https://dashboard.stryker-mutator.io/reports/github.com/TechNobre/PowerUtils.Geolocation/improve-mutations-tests-372

[Copilot]

Copilot review overview

🟡 Changes recommended

The configured SonarCloud project key does not match the repository’s documented key.

Review effort: Lite
Findings: 1

Open (1)

• Use the documented SonarCloud project key · New

What changed in this PR

Updates the SonarCloud workflow to use a workflow-level environment variable for the project key.

Changes:

• Adds SONAR_PROJECT_KEY to the workflow environment.
• Uses the variable during SonarCloud analysis.

File	Summary
.github/​workflows/​sonarcloud-and-mutations.yml	Configures and uses the SonarCloud project key; the key must match the repository’s documented project key.

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[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
PowerUtils.Geolocation	100%	99%	131	✔
Summary	100% (181 / 181)	99% (69 / 70)	131	✔

[github-actions]

Test Summary

    5 files      5 suites   1s ⏱️
  252 tests   252 ✅ 0 💤 0 ❌
1 260 runs  1 260 ✅ 0 💤 0 ❌

Results for commit e188b24.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud