refactor: Remove final-tests-counts from catalog, have dry-run work as expected

[gmuloc]

Description

1. AntaCatalog.final_tests_counts was not working correctly when reusing a catalog multiple time in a runner
2. --dry-run command is expected to return a ResultManager with all the "would-be-run" tests with a status of unset.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have run pre-commit for code linting and typing (pre-commit run)
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes (tox -e testenv)

[codspeed-hq]

CodSpeed Performance Report

Congrats! CodSpeed is installed 🎉

🆕 4 new benchmarks were detected.

You will start to see performance impacts in the reports once the benchmarks are run from your default branch.

Detected benchmarks

• test_anta[1 device] (1 s)
• test_anta[2 devices] (2 s)
• test_anta_dry_run[1 device] (69.9 ms)
• test_anta_dry_run[2 devices] (125.9 ms)

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
92.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[mtache]

LGTM