feat: [Badges] support Credly authorization token refresh

[GlugovGrGlib]

Description

Credly authorization tokens expire 180 days after issuance (Credly authentication methods). Until now the Credentials service stored a static API key with no record of when it was issued, so once the token expired, badge issuance and template sync silently started failing until an operator manually replaced the key.

This PR adds token lifetime tracking and automatic rotation:

• CredlyOrganization gains an authorization_token_issued_at field (set on issuance and every rotation), plus authorization_token_expires_at and authorization_token_days_until_expiry helpers (180-day lifetime).
• CredlyAPIClient.rotate_authorization_token() calls Credly's POST /v1/organizations/{organization_id}/authorization_tokens/rotate endpoint (API reference), persists the new token and refresh timestamps, and adopts the new token for subsequent requests.
• New refresh_credly_authorization_tokens management command, intended for a periodic (e.g. daily) run:
  • logs a warning when a token is within 30 days of expiration;
  • automatically rotates it once fewer than 5 days remain;
  • supports --organization_id <uuid> to limit scope and --force to rotate immediately;
  • warns (without rotating) when an organization has no recorded issuance date.

Fixes #2984

Testing

• pytest credentials/apps/badges/tests/ — 145 passed.
• makemigrations badges --check — no missing migrations.

Remaining work (draft)

• Verify the rotation response shape (data.token) against a Credly sandbox — the public docs do not document the response payload, and rotation invalidates the old token immediately.
• Skip organizations whose API key is preconfigured via BADGES_CONFIG["credly"]["ORGANIZATIONS"] (their DB api_key is blank; rotation would fail and could invalidate the settings-provided token).
• Expose the new token date fields (and derived expiry) in the Django admin so operators can see token status and seed the issuance date for existing organizations.
• Document the 180-day expiry, the new command, and its recommended scheduling in docs/sharing/badges/ (operator docs in the Credly configuration page, plus a quickstart note).
• Consider a distinct message for already-expired tokens, where rotation can no longer succeed.

JavaScript tests

No JavaScript changes in this PR — Karma checklist not applicable.

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