31243 fix solr admin app ci

[ahamood1]

Issue #, if available: 31243

Description of changes:

1. Update Selenium Usage: Replace executable_path with the Service class when initializing Selenium WebDriver, as executable_path is no longer supported in Selenium 4.x.
2. Reuse SQLAlchemy Instance: In tests, use the existing models.db instance instead of creating a new SQLAlchemy(app) to avoid double registration.
3. Set SOLR_URL for Tests: Ensure the SOLR_URL environment variable is set in CI or mock it in tests to prevent related failures.

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[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

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