fix: Implement fetch-retry locally

[jonkafton]

What are the relevant tickets?

Relates to https://github.com/mitodl/hq/issues/7238

Description (What does it do?)

Ports a subset of fetch-retry into the project.

How can this be tested?

• No functional change from the main branch.

• Test criteria from feat: retry failed aichat requests #110 should pass.

Additional Context

#110 added fetch-retry as a dependency. Upgrading to the latest @mitodl/smoot-design in the MIT Learn project, the app runs without issue, though the Jest unit tests were seeing the error below:

  ● Channel Pages, Unit only › Displays the channel logo

    TypeError: (0 , fetch_retry_1.default) is not a function

      at Object.<anonymous> (../../../node_modules/@mitodl/smoot-design/dist/cjs/utils/retryingFetch.js:27:49)
      at Object.<anonymous> (../../../node_modules/@mitodl/smoot-design/dist/cjs/components/AiChat/AiChatContext.js:27:25)
      at Object.<anonymous> (../../../node_modules/@mitodl/smoot-design/dist/cjs/components/AiChat/AiChat.js:28:25)
      at Object.<anonymous> (../../../node_modules/@mitodl/smoot-design/dist/cjs/ai.js:4:16)
      at Object.<anonymous> (page-components/LearningResourceExpanded/AiChatSyllabusSlideDown.tsx:2336:27)
      at Object.<anonymous> (page-components/LearningResourceExpanded/LearningResourceExpanded.tsx:3306:66)
      at Object.<anonymous> (page-components/LearningResourceDrawer/LearningResourceDrawer.tsx:2861:27)
      at require (app-pages/ChannelPage/ChannelPage.tsx:15:5)

The tsc build complies ESM and CommonJS builds from smoot-design source, excluding any dependencies, which are imported directly in projects. The fetch-retry produces a single UMD build with Rollup. The app works (uses the UMD version which gets bundled by the app's bundler), though running Jest the tests fail when (using the CJS smoot-design version and the UMD fetch-retry module directly). Jest module system doesn't seem to handle UMD modules as well as modern bundlers.

Given the fetch-retry is small (full source), has no dependencies and we are only using a subset of it's API (we provide retryDelay and retryOn as functions), it makes best sense to find alternatives to fetch-retry that would work better with dual-format packages or just port the code into the project. This PR does the latter.

[github-actions]

Pre-release workflow has completed successfully.
Published version: 0.0.0-d04c42a

To update a previously-installed version with yarn:

yarn up @mitodl/[email protected]

[gumaerc]

This code works, I can see the requests retrying and eventually failing. Overall I think it makes more sense to implement these kinds of things locally anyway, because they're so simple. It feels like an easy target for a leftpad kind of attack.

[github-actions]

Pre-release workflow has completed successfully.
Published version: 0.0.0-bafccd3

To update a previously-installed version with yarn:

yarn up @mitodl/[email protected]

[github-actions]

🎉 This PR is included in version 6.6.1 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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