ci: add 70% test coverage gate for documents module (#753)

[Yash-Karakoti]

ci: enforce 70% test coverage gate for documents module (#753)

Description

This PR introduces a dedicated CI gate to enforce a minimum test coverage of 70% for the documents module. This ensures that any future changes or hardening of the documents slice will not introduce regressions in test coverage, maintaining the reliability of the module.

Resolves Issue

• Closes [C7] Add CI gate: documents module test coverage > 70% #753

Changes Made

• Modified the CI pipeline (.github/workflows/ci.yml) to include a new, specific test step for the documents module.
• Utilized the Jest CLI to isolate coverage collection to the src/documents directory using the --collectCoverageFrom flag.
• Implemented a strict 70% threshold across statements, branches, functions, and lines via the --coverageThreshold argument.

Testing & Verification

• The GitHub Actions CI pipeline will now automatically run this isolated coverage check on all Pull Requests targeting main and develop.
• Reviewers can verify the successful execution by checking the test job logs in the Actions tab for this PR. If the coverage falls below 70%, the pipeline will fail and block the merge.

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