Dropdown: Fix issue where enter, escape, and space key are not having desired output

[austinoneil]

Description

• Delete excessive calls to methods that react to input
• Update tests to better reflect a user journey, replacing existing unit tests with more black-box e2e tests.

References #2392

Type of change

• 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 not work as expected)
• Documentation update

How Has This Been Tested?

E2E tests, manually using the following code in index.html:

    <modus-dropdown toggle-element-id="toggleElement">
      <modus-button id="toggleElement" slot="dropdownToggle" show-caret="true">Dropdown</modus-button>
      <modus-list slot="dropdownList">
        <modus-list-item size="condensed" borderless>Item 1</modus-list-item>
        <modus-list-item size="condensed" borderless>Item 2</modus-list-item>
        <modus-list-item size="condensed" borderless>Item 3</modus-list-item>
      </modus-list>
    </modus-dropdown>
    <modus-text-input></modus-text-input>

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

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