[Smoke & CO Alarm Cluster] Subscription step mismatch between Test Plan and YAML scripts (TC-SMOKECO-2.4, 2.5, 2.6)

During validation of the Smoke and CO Alarm Cluster, mismatches were found between the Test Plan and the corresponding YAML test scripts.
In multiple steps, the YAML script includes a subscription operation that is not specified in the Test Plan.

Affected Test Cases:

1. TC-SMOKECO-2.4

• Mismatch in Step 47 — the Test Plan does not specify a subscription, but the script performs one.
• Note: Step 38 also includes a subscription, but it is aligned with the Test Plan.

2. TC-SMOKECO-2.5

• Same issue observed in Steps 52, 56, 62, 68, and 72.

3. TC-SMOKECO-2.6

• Same issue observed in Steps 9, 11, 13, 15, 17, 23, 26, 29, and 32.

Expected Behavior:

• YAML scripts should match the Test Plan behavior.
• Subscription steps should be implemented only where the Test Plan explicitly defines them.

Proposed Fix:

• Review and remove (or justify) the unintended subscription steps from the YAML scripts.
• Ensure script steps are consistent with the Test Plan expectations for each test case.

Test-plan Reference : https://github.com/CHIP-Specifications/chip-test-plans/blob/master/src/cluster/smco.adoc#test-cases
Script Reference :

• https://github.com/project-chip/connectedhomeip/blob/master/src/app/tests/suites/certification/Test_TC_SMOKECO_2_4.yaml
• https://github.com/project-chip/connectedhomeip/blob/master/src/app/tests/suites/certification/Test_TC_SMOKECO_2_5.yaml
• https://github.com/project-chip/connectedhomeip/blob/master/src/app/tests/suites/certification/Test_TC_SMOKECO_2_6.yaml

Start by comparing the listed steps in Test_TC_SMOKECO_2_4.yaml, Test_TC_SMOKECO_2_5.yaml, and Test_TC_SMOKECO_2_6.yaml with the referenced Smoke and CO test-plan cases. Check each reported subscription operation against the plan, then remove or document only the mismatches. Done means all three YAML scripts follow the explicitly defined subscription behavior.