fix(log_to_metric transform): set not working in log-to-metric transform when all_metrics=true (#20228)

* Fixing bug - set missing in log-to-metric transform

* Adding a test case

* Adding unit test

* Create 20228_fix-log-to-metric-set-supported.fix.md

* Update 20228_fix-log-to-metric-set-supported.fix.md

* Update changelog.d/20228_fix-log-to-metric-set-supported.fix.md

Co-authored-by: Jesse Szwedko <jesse@szwedko.me>

* Update changelog.d/20228_fix-log-to-metric-set-supported.fix.md

Co-authored-by: Jesse Szwedko <jesse@szwedko.me>

* cargo fmt

Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>

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Signed-off-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>
Co-authored-by: Jesse Szwedko <jesse@szwedko.me>
Co-authored-by: Jesse Szwedko <jesse.szwedko@datadoghq.com>