test #192: created tests for GroupCard component

[tonyb650]

Description

Before:

The GroupCard component lacked unit tests.

After:

Unit tests have been added for GroupCard component:

• renders the expected elements: group name, group image, member count & formatted date. The formatDate function is mocked to avoid time zone issues.
• "member count" is singular when count is 1
• "member count" is plural when count is not 1
• the card has the correct href attribute to correctly link to the group's /gift-exchanges/ page

Unit test has been added for GroupCardSkeleton component:

• renders as expected. The outer-most <div> element is updated with data-testid="group-card-skeleton".

Closes #192

Pre-submission checklist

• Code builds and passes locally
• PR title follows Conventional Commit format (e.g. test #001: created unit test for __ component)
• Request reviews from the Peer Code Reviewers and Senior+ Code Reviewers groups
• Thread has been created in Discord and PR is linked in gis-code-questions

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