C3: Refactor dns polling to improve experience for WARP users

[jculvey]

What this PR solves / how to test:

This gives WARP users a smoother experience by doing a more custom lookup of DNS that avoid potential caching issues.

Associated docs issue(s)/PR(s):

• [insert associated docs issue(s)/PR(s)]

Author has included the following, where applicable:

• Tests
• [ x ] Changeset (Changeset guidelines)

Reviewer is to perform the following, as applicable:

• Checked for inclusion of relevant tests
• Checked for inclusion of a relevant changeset
• Checked for creation of associated docs updates
• Manually pulled down the changes and spot-tested

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[changeset-bot]

🦋 Changeset detected

Latest commit: de8af8e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
create-cloudflare	Patch

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[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/5825276025/npm-package-wrangler-3729

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/5825276025/npm-package-wrangler-3729

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/5825276025/npm-package-wrangler-3729 dev path/to/script.js

Additional artifacts:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/5825276025/npm-package-cloudflare-pages-shared-3729

Note that these links will no longer work once the GitHub Actions artifact expires.

[codecov]

Codecov Report

Merging #3729 (2ea5f12) into main (94fed9d) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3729      +/-   ##
==========================================
+ Coverage   75.17%   75.21%   +0.04%     
==========================================
  Files         194      194              
  Lines       11410    11410              
  Branches     3013     3013              
==========================================
+ Hits         8577     8582       +5     
+ Misses       2833     2828       -5     

see 3 files with indirect coverage changes

[IgorMinar]

I really like what you did with the dns2 library here, James. At the high level the change looks good. Could you please review the minor suggestions mostly related to readability and documentation? Thanks

[IgorMinar]

LGTM! Thanks for all the improvements.

[IgorMinar]

oops.. just noticed that the test is failing.. due to a flake? please take a look

[jculvey]

oops.. just noticed that the test is failing.. due to a flake? please take a look

Yep, dealing with some flakiness, working through it now.