fix(timepicker): resolve combobox display issue

[Jason20020]

Description

I set the AmPmComboBox as absolute to let the option box will popover outside container and I create an empty div in generateAmPmComboBox, set the width to AmPmComboBox width to ensure the justify content center will work perfect. Then using transform to translate the amPm combo box - width back to its position.

Related Issue

Motivation and Context

The popover of am-pm-combo-box in date-time-picker not appear outside the date-time popover

How Has This Been Tested?

Yarn build not show error.

Screenshots:

Before (If applicable):

After:

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation update
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Other... Please describe:

Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

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

Project coverage is 94.77%. Comparing base (b73c360) to head (03ee9f1). Report is 308 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1697 +/- ## ========================================== + Coverage 94.02% 94.77% +0.74% ========================================== Files 132 134 +2 Lines 18176 19524 +1348 Branches 2769 3066 +297 ========================================== + Hits 17090 18503 +1413 + Misses 1086 1021 -65 ```

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