fix(client): filter challenge nodes by certification to fix progress bar

[ragini-pandey]

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• I have read and followed the contribution guidelines.
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• My pull request targets the main branch of freeCodeCamp.
• I have tested these changes either locally on my machine, or GitHub Codespaces.

Closes #67048

Problem

The progress bar after completing a challenge in the JavaScript v9 curriculum only fills to ~50% maximum (e.g. shows 7% for 1 out of 7 completed challenges instead of 14%).

Root cause: 446 block names are shared across multiple superblocks (e.g. workshop-greeting-bot exists in both javascript-v9 and introduction-to-variables-and-strings-in-javascript). The allChallengeNode GraphQL query returns nodes for all superblocks, so getCurrentBlockIds was collecting challenge IDs from all superblocks that share the same block name. This doubled currentBlockIds.length for shared blocks:

• A 7-challenge block appeared to have 14 IDs → 1/14 = 7% (instead of 1/7 = 14%)
• Completing all 7 visible challenges → 7/14 = 50%

Fix

1. client/src/templates/Challenges/utils/fetch-all-curriculum-data.tsx — Added certification to the allChallengeNode GraphQL query so it's available for filtering.

2. client/src/utils/get-completion-percentage.ts — Added certification to the challengeNodes filter in getCurrentBlockIds, ensuring only challenges belonging to the current superblock are counted.

3. client/src/utils/get-completion-percentage.test.ts — Added a regression test covering the shared-block scenario.

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