fix(anta): Fix ResultManager statistics

[carl-baillargeon]

Description

Fix ResultManager statistics. ResultManager stats are only updated when needed.

Fixes #948

Checklist:

• Update documentation
• Update unit tests

[codspeed-hq]

CodSpeed Performance Report

Merging #962 will degrade performances by 17.22%

_{Comparing carl-baillargeon:fix/issue_948 (f16a835) with main (6ee2c08)}

Summary

⚡ 4 improvements
❌ 2 (👁 2) regressions
✅ 16 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	carl-baillargeon:fix/issue_948	Change
⚡	test_anta_dry_run[1-device]	61.2 ms	53.9 ms	+13.61%
⚡	test_anta_dry_run[2-devices]	108.2 ms	94.6 ms	+14.39%
👁	test_table_devices[1-device]	240 µs	277.2 µs	-13.42%
👁	test_table_devices[2-devices]	251.4 µs	303.7 µs	-17.22%
⚡	test_get_coroutines[1-device]	47.6 ms	40.3 ms	+18%
⚡	test_get_coroutines[2-devices]	93.2 ms	79.5 ms	+17.32%

[gmuloc]

LGTM - we can approve the codspeed impact

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud