fix: update lmp calculation to fix flaky test

[Benmuiruri]

Description

The test /tests/e2e/default/contacts/contact-details.wdio-spec.js started being flaky on the CI as noted by #9155.

The initlal lmp calculation was const lmp = moment().subtract(3, 'months');
My initial hypothesis and investigation suggested the lmp value was varying depending on the date the test is run and how many days the previous 3 months had.

Therefore, the fix I came up with was to use a fixed date and then subtract a specific number of days so that lmp will always be 12 weeks.

Unfortunately, the test is still flaky.

• The original const lmp = moment().subtract(3, 'months');fails by giving 13 weeks instead of the expected 12 weeks
• The fix to use 👇, also fails giving 13 weeks instead of the expected 12 weeks

const fixedPregDate = moment('2024-06-03');
const lmp = fixedPregDate.subtract(84, 'days');

If you run any of the two above in master, the test fails.

The change made in this PR hopefully stabilises the test but @lorerod I welcome your thought on this

Code review checklist

• Readable: Concise, well named, follows the style guide, documented if necessary.
• Documented: Configuration and user documentation on cht-docs
• Tested: Unit and/or e2e where appropriate
• Internationalised: All user facing text
• Backwards compatible: Works with existing data and configuration or includes a migration. Any breaking changes documented in the release notes.

Compose URLs

If Build CI hasn't passed, these may 404:

• Core
• CouchDB Single
• CouchDB Cluster

License

The software is provided under AGPL-3.0. Contributions to this project are accepted under the same license.

[dianabarsan]

This is blocking me. Approving to get a green build on another branch.