2 MB issue Fix for External, Tests, Tests UI

[RounakDhillon]

2 MB issue Fix for External, Tests, Tests UI

[ayush-shah]

Code review completed for #203 on May 5, 2026.

Reviewed scope: external ingestion, test definitions, and Tests UI split.

Checks performed:

• Confirmed Mintlify deployment and link-rot checks are green.
• Confirmed GitHub reports the PR as mergeable, with branch protection still requiring review.
• Validated docs.json parses successfully on the PR head.
• Verified every newly split MDX page has frontmatter.
• Verified every newly split MDX page is registered in docs.json navigation.
• Checked changed-page sizes after the split; all reviewed MDX files are far below the 2 MB limit.

Result: no blocking review findings. This PR is good to merge once the required reviewer approval/branch protection is satisfied.