Fix test_statictime for p.a.discussion comments

[instification]

Needed for https://github.com/plone/plone.app.discussion/pull/204

Tests won't pass until https://github.com/plone/plone.app.discussion/pull/204 is merged as it is a co-dependent change.

Updating p.a.discussion to set timezone aware times.

The current test is checking for a timezone, but there isn't one so the following code wasn't getting executed:

if pydt.tzinfo is not None:
    now = pydt.tzinfo.localize(now)

but pydt.tzinfo.localize is not a function so I have removed this check.

As the times coming from p.a.discussion will be tz aware, this update fixes the tests to compare using timezones.

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[mister-roboto]

@instification thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!

[davisagli]

@instification Is it possible to make this work both with and without the change in plone.app.discussion? The challenge is that plone.restapi still supports both Plone 5.2 and Plone 6.0 from a single release branch, but the change in plone.app.discussion to use timezone-aware datetimes is for Plone 6 only.