[3.59] Fix shopify theme dev proxy to use development theme

[karreiro]

WHY are these changes introduced?

Fix the shopify theme dev proxy to use the development theme, even when users have a browser session with the live theme loaded. I noticed this edge case while conducting additional manual tests for #3769.

WHAT is this pull request doing?

This PR updates the proxy to serve the 302 response when the development theme ID is set.

How to test your changes?

Before

After

Post-release steps

None.

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've made sure that any changes to dev or deploy have been reflected in the internal flowchart.

[github-actions]

Thanks for your contribution!

Depending on what you are working on, you may want to request a review from a Shopify team:

• Themes: @shopify/advanced-edits
• UI extensions: @shopify/ui-extensions-cli
  • Checkout UI extensions: @shopify/checkout-ui-extensions-api-stewardship
• Hydrogen: @shopify/hydrogen
• Other: @shopify/cli-foundations

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	72.01%	6930/9623
🟡	Branches	69.1%	3413/4939
🟡	Functions	71.19%	1851/2600
🟡	Lines	73.29%	6535/8917

Test suite run success

1653 tests passing in 765 suites.

Report generated by 🧪jest coverage report action from 0ae2173

[github-actions]

Differences in type declarations

We detected differences in the type declarations generated by Typescript for this branch compared to the baseline ('main' branch). Please, review them to ensure they are backward-compatible. Here are some important things to keep in mind:

• Some seemingly private modules might be re-exported through public modules.
• If the branch is behind main you might see odd diffs, rebase main into this branch.

New type declarations

We found no new type declarations in this PR

Existing type declarations

packages/cli-kit/dist/public/common/version.d.ts

@@ -1 +1 @@
-export declare const CLI_KIT_VERSION = "3.59.0";
\ No newline at end of file
+export declare const CLI_KIT_VERSION = "3.59.1";
\ No newline at end of file

[karreiro]

(back-ported #3772 to get robocop passing)