Assign idle task to each core before the SMP scheduler start

[chinglee-iot]

Description

All the cores start with idle tasks before the SMP scheduler is running.

In this PR:

• Assign idle task to each core when they are created in prvCreateIdleTasks().

Test Steps

N/A

Checklist:

• [x] I have tested my changes. No regression in existing tests.
• [ ] I have modified and/or added unit-tests to cover the code changes in this Pull Request.

Related Issue

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (460e953) 93.43% compared to head (701289d) 93.42%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #945 +/- ## ========================================== - Coverage 93.43% 93.42% -0.01% ========================================== Files 6 6 Lines 3199 3195 -4 Branches 890 887 -3 ========================================== - Hits 2989 2985 -4 Misses 103 103 Partials 107 107 ``` | [Flag](https://app.codecov.io/gh/FreeRTOS/FreeRTOS-Kernel/pull/945/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FreeRTOS) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/FreeRTOS/FreeRTOS-Kernel/pull/945/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FreeRTOS) | `93.42% <100.00%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FreeRTOS#carryforward-flags-in-the-pull-request-comment) to find out more.

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[sonarcloud[bot]]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

1 New issue
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud