RDK-48831 : L2 Test With CI Integration For SystimeManager

[Saranya2421]

Fix Description:
Added L2 Testcases for SystemTimeManager

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1 out of 2 committers have signed the CLA.

✅ nhanasi
❌ Saranya

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[nhanasi]

Looks good please make sure all github actions are passed before merge @Saranya2421

[nhanasi]

Looks good please make the Yaml file correction to use main,develop branch