[Workflows] Add pricing note

[mia303]

Summary

Rollbacks & retries not included in Workflows step count for pricing

Documentation checklist

• The change adheres to the documentation style guide.

[github-actions]

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

Pattern	Owners
/src/content/docs/workflows/	@elithrar, @rita3ko, @irvinebroque, @vy-ton, @celso, @deloreyj, @mia303, @jonesphillip, @cloudflare/product-owners

[github-actions]

Nimbus Preview URL: https://nimbus-5c1ebf89.preview.developers.cloudflare.com
Nimbus Preview Branch URL: https://nimbus-workflows-update-rollback-pricing.preview.developers.cloudflare.com

[github-actions]

Preview URL: https://5c1ebf89.preview.developers.cloudflare.com
Preview Branch URL: https://workflows-update-rollback-pricing.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workflows/reference/pricing/	https://workflows-update-rollback-pricing.preview.developers.cloudflare.com/workflows/reference/pricing/

[vy-ton]

Note/info should also be mentioned on observability/metrics docs too

[cloudflare-docs-bot]

Review

✅ No issues found in commit 5c1ebf8.

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