[Uptime] Mock prototype in unit test to prevent relative date breaking snapshots.

[justinkambic]

Summary

Fixes #73522.

A call to a moment function was using relative time, and it has been two years since the date specified, so it started providing a different value, which has caused the test snapshot to break. I've mocked the moment prototype in the test file and it has resolved the problem for me locally.

Checklist

Delete any items that are not applicable to this PR.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
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• Unit or functional tests were updated or added to match the most common scenarios
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• This was checked for breaking API changes and was labeled appropriately

[elasticmachine]

Pinging @elastic/uptime (Team:uptime)

[tylersmalley]

I verified this fix locally and am merging to unblock CI.

[tylersmalley]

7.x/7.10: 3c6202f
7.9: 9957fe1
7.8: 3aca2dc

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 453116e

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[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create backports run node scripts/backport --pr 73531 or prevent reminders by adding the backport:skip label.

[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create backports run node scripts/backport --pr 73531 or prevent reminders by adding the backport:skip label.

[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create backports run node scripts/backport --pr 73531 or prevent reminders by adding the backport:skip label.

[justinkambic]

I've applied backport:skip to avoid the bot notifying on this branch. Based on the comment above, the fix was ported to all necessary release branches.