Simplify and fix bundle size workflow

[dhruvkb]

Description

This PR

• re-enables the bundle size workflow that had been disabled due to a wrong if condition.
• uses the get-changes action to only run when there is a possibility of the bundle size to change.

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  Update index.md).
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[github-actions]

Full-stack documentation: Ready

https://WordPress.github.io/openverse/_preview/894

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[zackkrida]

LGTM.

uses the get-changes action to only run when there is a possibility of the bundle size to change.

This will now run on any frontend-related file change as defined by get-changes, correct? I just want to confirm my understanding.

[AetherUnbound]

LGTM!