feat: add pagination support to fetch all badge templates

[luisfelipec95]

Description

This PR enhances the synchronization process of badge templates from the Credly API by implementing pagination support.

Previously, the fetch_badge_templates function only retrieved the first page of results (up to 50 templates).
Now, the function iterates through all available pages to fetch every active badge template, ensuring no data is missed during synchronization.

Supporting information

• No migrations; no operator action required for default deployments.

Testing instructions

• Executed sync_organization_badge_templates for an organization with more than 50 templates.
• Confirmed that the total number of local records matches the total returned by the API.

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[e0d]

@luisfelipec95 Thanks for this. It looks like some of the tests are failing, can you have a look?

[e0d]

A few robustness questions:

1. What's a reasonable maximum number of pages?
2. What happens if you hit a rate limit or timeout?
3. should you throttle the calls to not be flagged as a bot or overwhelm the backend?
4. Is this ever called from a request to the credentials frontend?