fix: adds a function to get latest token by createdAt

[sandsinh]

Summary

• Adds findLastCreatedBySiteIdAndTokenType to TokenCollection to retrieve the most recently created token for a given site and token type, regardless of cycle
• Useful when callers need the latest token across all cycles rather than a specific cycle
• Validates required parameters and throws DataAccessError on missing input

Test plan

• Unit tests pass: npm test -w packages/spacecat-shared-data-access
• Integration tests pass: npm run test:it -w packages/spacecat-shared-data-access (requires Docker)
• Verify findLastCreatedBySiteIdAndTokenType returns null when no tokens exist for a site/type
• Verify it returns the most recently created token when multiple cycles exist
• Verify it throws when siteId or tokenType is missing

🤖 Generated with Claude Code

[github-actions]

This PR will trigger a patch release when merged.