feat: enable firefox arm64 build with cypress/factory

[MikeMcC399]

• closes Enable Firefox arm64 in cypress/factory build #1306

Situation

• Until now, Cypress Docker images only had access to x86 versions of Firefox. The examples/firefox-esr additionally demonstrated how to build Firefox from the ESR (Extended Support Release) channel into a custom Cypress Docker image.

• With the release of Firefox 136.0, Mozilla announced:

  On Linux, Firefox is now available on ARM64 (AArch64), with installation options via APT and tarballs. Flatpak support is coming soon.

• factory/installScripts/firefox skips installation if x64 is not detected. This prevents any attempt to install Firefox for arm64.

Change

Modify scripts in factory/installScripts/firefox to allow installing Firefox arm64 in addition to amd64:

CDN is

• https://download-installer.cdn.mozilla.net/pub/firefox/releases/<version>/linux-x86_64/en-US/ for amd64
• https://download-installer.cdn.mozilla.net/pub/firefox/releases/<version>/linux-aarch64/en-US/ for arm64 (new)

This change is backwards-compatible with previous versions of Firefox.

Add Firefox arm tests to factory/test-project/docker-compose.yml. These tests could be made required in GitHub branch protection rules at a later stage.

In factory/.env make the following updates:

Environment variable	Before	After
FACTORY_VERSION	5.4.0	5.5.0
FACTORY_DEFAULT_NODE_VERSION	22.14.0	no change
CHROME_VERSION	134.0.6998.88-1	no change
EDGE_VERSION	134.0.3124.51-1	no change
FIREFOX_VERSION	136.0.1	no change

Outcome

• Custom Cypress Docker images built for the arm64 architecture can contain Firefox >=136.0
• When FIREFOX_VERSION or FACTORY_DEFAULT_NODE_VERSION is bumped in any future PR, any new Debian Linux arm64 Cypress Docker images cypress/browsers and cypress/included will include Firefox

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.

[MikeMcC399]

@jennifer-shehane / @AtofStryker

This PR is ready for review and merge.

There is effectively no change for the amd64 (x64) images. They continue to include Firefox.
For arm64 images the functionality is improved by adding Firefox as the only browser apart from Electron.
Browser versions are also all bumped to latest as well.

This seems like a good addition.

As a follow-up, documentation should be updated, however I don't think this PR should be held up waiting for documentation, as it is only an addition. Nothing is being lost. It also gives the opportunity to test with the released Cypress Docker images before updating the documentation.

[MikeMcC399]

Re-based on Cypress 14.2.0

[AtofStryker]

Hey @MikeMcC399 . Sorry for the delay in the review here. Just been a bit caught up with some other things. Everything looks good here. Going to merge in

[MikeMcC399]

@AtofStryker

Sorry for the delay in the review here. Just been a bit caught up with some other things. Everything looks good here. Going to merge in

Many thanks for reviewing and merging in! I will follow up with a documentation PR soon.