Updating docs for upcoming queues free tier

[mia303]

Summary

Removing references to Queues paid requirements & adding free tier limits into documentation

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.

[github-actions]

This PR requires additional review attention because it affects the following areas:

Partials

This PR updates partial files, which are pieces of content used across multiple files in our Render component.

• queues/enable-queues - view affected files
• workers/queues_pricing - view affected files

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/queues/	@elithrar, @jonesphillip, @harshil1712, @mia303, @cloudflare/pcx-technical-writing
/src/content/docs/r2/	@oxyjun, @elithrar, @jonesphillip, @aninibread, @harshil1712, @cloudflare/workers-docs, @cloudflare/pcx-technical-writing
/src/content/partials/queues/	@elithrar, @rita3ko, @irvinebroque, @vy-ton, @cloudflare/pcx-technical-writing
/src/content/partials/workers/	@cloudflare/workers-docs, @GregBrimble, @irvinebroque, @mikenomitch, @WalshyDev, @cloudflare/deploy-config, @cloudflare/pcx-technical-writing, @cloudflare/wrangler, @mattietk

[github-actions]

Preview URL: https://51d7cfa9.preview.developers.cloudflare.com
Preview Branch URL: https://queues-free-tier.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/r2/tutorials/upload-logs-event-notifications/	https://queues-free-tier.preview.developers.cloudflare.com/r2/tutorials/upload-logs-event-notifications/
https://developers.cloudflare.com/queues/platform/limits/	https://queues-free-tier.preview.developers.cloudflare.com/queues/platform/limits/
https://developers.cloudflare.com/r2/tutorials/summarize-pdf/	https://queues-free-tier.preview.developers.cloudflare.com/r2/tutorials/summarize-pdf/
https://developers.cloudflare.com/queues/	https://queues-free-tier.preview.developers.cloudflare.com/queues/