refactor(autocomplete): use plugins

[thecristen]

Summary of changes

No ticket / foundational work ahead of AutocompleteJS v1.0 | Sales locations pages

Instead of hacking together a complex sources configuration, we clean up the logic a bit by separating each of location searching, geolocating, and Algolia searching into distinct plugins. This'll make it easier to plug-and-play with as we update other search inputs across the website.

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General checks

• Are the changes organized into self-contained commits with descriptive and well-formatted commit messages? This is a good practice that can facilitate easier reviews.
• Testing. Do the changes include relevant passing updates to tests? This includes updating screenshots. Preferably tests are run locally to verify that there are no test failures created by these changes, before opening a PR.
• Tech debt. Have you checked for tech debt you can address in the area you're working in? This can be a good time to address small issues, or create Asana tickets for larger issues.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ SyntaxError: JSON Parse error: Unexpected identifier "undefined" <anonymous>(ts/ui/autocomplete/plugins/locations) View Issue
• ‼️ SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data 28407/e.default/getSources/getItems/</</<(ts/ui... View Issue

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