1344: remove unneeded plausible env vars

[DNR500]

Relates to 1344

This PR does NOT change analytics behaviour in editor-ui -  it removes environment variables that are not wired into editor-ui analytics and could cause confusion.

What changed

• No functional changes were introduced to Plausible event names or event trigger points in editor-ui.
• We validated that key UI actions are still calling window.plausible(...) as expected.

Why the env vars aren’t needed

• Analytics bootstrap/config changes are handled in editor-standalone.
• editor-ui event emission continues to work through that integration, using window.plausible() provided by editor-standalone.
• The env vars removed in this PR are not actually connected to editor-ui event dispatch.


What this means

• editor-ui remains the source of UI event calls.
• editor-standalone remains responsible for loading/configuring Plausible.
• This preserves existing tracking behaviour while reducing config ambiguity.

Checks

• Confirmed window.plausible(...) calls fire from editor-ui actions in local development, using the window.plausible function established by editor-standalone.

[Copilot]

Pull request overview

Removes unused Plausible-related environment variables from this repo’s example environment file and GitHub Actions workflows, reducing configuration ambiguity while keeping editor-ui analytics event emission unchanged (still via window.plausible(...) provided by editor-standalone).

Changes:

• Removed react_app_plausible_* workflow inputs and corresponding REACT_APP_PLAUSIBLE_* build env wiring from the deploy workflow.
• Removed REACT_APP_PLAUSIBLE_SOURCE from CI Cypress job environment.
• Removed REACT_APP_PLAUSIBLE_DATA_DOMAIN / REACT_APP_PLAUSIBLE_SOURCE from .env.example.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/deploy.yml	Drops unused Plausible workflow inputs and build-time env vars to avoid misleading configuration.
.github/workflows/ci-cd.yml	Removes an unused Plausible env var from the Cypress CI job and stops passing Plausible inputs to the deploy workflow.
.env.example	Removes unused Plausible env vars from the sample local configuration.

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[zetter-rpf]

Thanks for tidying up!