misc: convert @packages/launcher tests from mocha to vitest and always prefer 64-bit install paths to 32-bit

[AtofStryker]

• Closes N/A

Additional details

Converts the @packages/launcher tests to vitest from mocha.

Snapshots

snapshots should mostly be 1:1 but the vitest snapshots do include the versionRegex. The findAppParams snapshot values in the windows snapshot are not present because we do not actually calculate these values in the code for windows. They look like they came from the MacOS detector at some point due to the values populated in the snapshot, all to say these are not expected to be carried over into the new snapshots.

Tests

A lot of the detector tests needed to be reworked as we can longer leverage withArgs or callsArgAsync, so many of the mocking around the child process leverages callback handlers that are defined in the test to get a specific outcome from the yielding process.

We no longer stub utils.getOutput or helper methods and instead mock the libraries they are consuming, such as 'child_process' or 'win-version-info' to more accurately test our implementation.

This tests the same functionality, except maybe slightly deeper, but overall the tests are the same

Implementation

Only thing that has really changed with the implementation is to always prioritize 64-bit browser installs over 32-bit. Before, the priority was mixed and this makes the prioritization consistent

Steps to test

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has a PR for user-facing changes been opened in cypress-documentation? chore: update order of browser detection to always prefer 64-bit  cypress-documentation#6296
• Have API changes been updated in the type definitions?

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Note

Migrates @packages/launcher tests from Mocha to Vitest, updates Windows browser detection to prefer 64‑bit installs, and adjusts CI/browser setup accordingly.

• Launcher:
  • Browser detection (Windows): Reorders search paths to prefer 64-bit installs; minor refactors (default fs import, direct getVersionString).
  • Tests: Replace Mocha/Chai/Sinon with Vitest; add Vitest snapshots/config; remove legacy Mocha files; update scripts/dependencies.
• Docs:
  • cli/CHANGELOG.md: Notes browser detection now prefers 64-bit installs.
  • guides/esm-migration.md: Marks packages/launcher as completed.
• CI:
  • Bumps CircleCI browser-tools orb and sets install_chrome replace_existing: true.
  • Updates expected Mocha result count (10 → 9).

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[cypress]

cypress    Run #66312

Run Properties:   Failed #66312  •  fcd1710e96: remove duplicate entry

Project	cypress
Branch Review	chore/launcher_vitest
Run status	Failed #66312
Run duration	20m 11s
Commit	fcd1710e96: remove duplicate entry
Committer	Bill Glesias
View all properties for this run ↗︎

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Test results
Failures	1
Flaky	10
Pending	1102
Skipped	4
Passing	26706
View all changes introduced in this branch ↗︎

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Warning

Partial Report: The results for the Application Quality reports may be incomplete.

UI Coverage  45.69%
Untested elements	184
Tested elements	159

Accessibility  97.97%
Failed rules	4 critical   8 serious   2 moderate   2 minor
Failed elements	101

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Tests for review

  cypress/e2e/studio/studio.cy.ts • 1 failed test • app-e2e

View Output

Test		Artifacts
Cypress Studio > updates an existing test with assertions		Test Replay Screenshots

  issues/28527.cy.ts • 1 flaky test • 5x-driver-electron

View Output

Test		Artifacts
issue 28527 > fails and then retries and verifies about:blank is not displayed		Test Replay Screenshots

  e2e/origin/config_env.cy.ts • 1 flaky test • 5x-driver-inject-document-domain-chrome

View Output

Test		Artifacts
cy.origin- Cypress.config() > serializable > overwrites different values in secondary if one exists in the primary		Test Replay

  commands/files.cy.js • 1 flaky test • 5x-driver-firefox

View Output

Test		Artifacts
src/cy/commands/files > #readFile > retries to read when ENOENT		</td> </tr></table>   commands/net_stubbing.cy.ts • 1 flaky test • 5x-driver-firefox View Output Test Artifacts ... > stops waiting when an xhr request is canceled </td> </tr></table>   issues/28527.cy.ts • 1 flaky test • 5x-driver-firefox View Output Test Artifacts issue 28527 > fails and then retries and verifies about:blank is not displayed Screenshots The first 5 flaky specs are shown, see all 10 specs in Cypress Cloud.