#CX-11790 : Adding role=alert for md-banner-alert

[yasagraw]

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots:

Before (If applicable):

After:

Types of changes

• [ ] 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.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.33 :warning:

Comparison is base (5749483) 94.38% compared to head (dc5a7a2) 94.05%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1464 +/- ## ========================================== - Coverage 94.38% 94.05% -0.33% ========================================== Files 134 134 Lines 18804 18804 Branches 2874 2864 -10 ========================================== - Hits 17749 17687 -62 - Misses 1055 1117 +62 ``` | [Impacted Files](https://app.codecov.io/gh/momentum-design/momentum-ui/pull/1464?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=momentum-design) | Coverage Δ | | |---|---|---| | [...ponents/src/components/alert-banner/AlertBanner.ts](https://app.codecov.io/gh/momentum-design/momentum-ui/pull/1464?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=momentum-design#diff-d2ViLWNvbXBvbmVudHMvc3JjL2NvbXBvbmVudHMvYWxlcnQtYmFubmVyL0FsZXJ0QmFubmVyLnRz) | `100.00% <100.00%> (ø)` | | ... and [5 files with indirect coverage changes](https://app.codecov.io/gh/momentum-design/momentum-ui/pull/1464/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=momentum-design)

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