Increase specificity of textfield icon and fix search autocomplete styling

[LFDanLu]

prevents specificity war between the icon own height/width and the one dictated by the textfield. Discovered via chromatic

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

RSP

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[LFDanLu]

hold off on merging, chromatic caught some weirdness that I can't reproduce locally yet bleh

[devongovett]

looks like it happens on main also https://reactspectrum.blob.core.windows.net/reactspectrum/c285f01174740e71da4b931365e9cb8aa325c680/storybook/index.html?path=/story/searchautocomplete--default&args=validationState:valid&providerSwitcher-express=false

[LFDanLu]

Ah I'll fix that in this PR as well then

[LFDanLu]

I've updated the search autocomplete input so that it looks like the input within the MobileComboBox tray (aka icon + loading spinner is placed before the 'x') This means the x is persisted when there is a spinner/validation icon to avoid an awkward empty space after :

Alternatively, I could remove the spectrum-Search--loadable and make it look like the following which is closer to its original form but IMO a bit worse looking:

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[LFDanLu]

Chromatic: https://www.chromatic.com/build?appId=5f0dd5ad2b5fc10022a2e320&number=514

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## API Changes

unknown top level export { type: 'identifier', name: 'Column' }
unknown top level export { type: 'identifier', name: 'Column' }
unknown type { type: 'link' }
unknown type { type: 'link' }
unknown type { type: 'link' }
unknown type { type: 'link' }
unknown type { type: 'link' }
unknown type { type: 'link' }