## **Description**

The "Delete MetaMetrics Data" e2e tests were recently broken due to a
change in CI configuration. The code-under-test was written to always
use the environment variable present for the data deletion source ID and
endpoint, but the e2e tests wrongly assumed that it would never be
present.

The service has been updated to use the fallback values for e2e test
builds, even if the environment variable is present.

[![Open in GitHub
Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/MetaMask/metamask-extension/pull/28221?quickstart=1)

## **Related issues**

Fixes CI failure currently on all branches (e.g.
https://app.circleci.com/pipelines/github/MetaMask/metamask-extension/108823/workflows/cbc57b89-8647-4219-b413-24df4fdad95c/jobs/4070258
)

This bug was introduced in #24503, but only began causing failures
recently when CI configuration was updated with these new environment
variables.

## **Manual testing steps**

See that the data deletion e2e tests succeed even with both data
deletion environment variables set.

## **Screenshots/Recordings**

N/A

## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
Extension Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.