Turn analytics composable into a plugin

[sarayourfriend]

Fixes

A pre-requisite for #3721

Description

Convert the useAnalytics composable into a plugin. I've chosen to take an approach where the composable still exists, but just acts as a thin wrapper around $sendCustomEvent from the new plugin. This (a) reduces code churn and (b) allows us to confirm that the change behaves exactly as we expected the previous version to behave. All tests asserting against the analytics events continue to work without changes.

Testing Instructions

All Playwright and unit tests should continue to pass without changes.

Furthermore, to confirm absolutely that the breakpoint, height and width variables still work as expected, run Plausible locally using just frontend/up followed by just frontend/init to get the custom events loaded. Then visit frontend through the Nginx container at http://0.0.0.0:50290

Perform a search and confirm that the three default props (listed above) match the expected values based on the viewport of your browser. Make multiple searches with different viewport sizes, especially making sure to trigger different breakpoints, and confirm that those events have the correct values.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• [N/A] I added or updated tests for the changes I made (if applicable).
• [N/A] I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• [N/A] I ran the DAG documentation generator (if applicable).

Developer Certificate of Origin

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[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/3811

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[openverse-bot]

Based on the medium urgency of this PR, the following reviewers are being gently reminded to review this PR:

@zackkrida
This reminder is being automatically generated due to the urgency configuration.

Excluding weekend¹ days, this PR was ready for review 4 day(s) ago. PRs labelled with medium urgency are expected to be reviewed within 4 weekday(s)².

@sarayourfriend, if this PR is not ready for a review, please draft it to prevent reviewers from getting further unnecessary pings.

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[zackkrida]

Works great! All of my local breakpoint, height, and width values are correct.