docs(dev_portal/test): remove refs of testing tools not used in project

[hainenber]

docs(dev_portal/test): remove refs of testing tools not used in project

SUMMARY

A very chore PR to remove references of tooling not used in Superset's backend testing. Or maybe @rusackas is doing some foreshadow? 👀

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

N/A

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[bito-code-review]

Bito Automatic Review Skipped - Files Excluded

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[codeant-ai-for-open-source]

Sequence Diagram

This PR removes mentions of testing tools (Factory Boy, MSW) that aren't used by the backend. The diagram shows the concise contributor -> repo -> CI -> docs-site flow for updating and publishing the documentation change.

sequenceDiagram
    participant Contributor
    participant Repo
    participant CI
    participant DocsSite

    Contributor->>Repo: Edit docs (remove Factory Boy, MSW) & open PR
    Repo->>CI: Trigger CI checks for PR
    CI-->>Repo: Validate docs change
    Repo->>Repo: Merge PR into main
    Repo->>DocsSite: Build & deploy updated docs
    DocsSite-->>Contributor: Updated documentation published

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[rusackas]

I admit... I'm starting to lose track of my own work. PR LGTM! :D