feat: upgrade ESLint to version 9

[pospisilf]

Before submitting your PR, please review the following checklist:

• CONSIDER adding a new test if your PR resolves an issue.
• DO keep pull requests small so they can be easily reviewed.
• DO make sure tests pass.
• DO make sure any public APIs changes are documented.
• DO make sure not to introduce any compiler warnings.

Before merging the PR:

• CHECK continuous integration of main branch is green.
• CHECK pull request check job is green.
• CHECK all pull request questions/requests are resolved.
• WAIT till PR is approved by at least 1 committer.

[pospisilf]

example project will be moved to https://github.com/redhat-developer/vscode-extension-tester-example and eslint version will be bumped there

[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 SonarCloud