[JENKINS-70779] Address Stylelint 15.x Deprecations

[SaarthakMaini]

These rules will still work in the current release of stylelint, but they would be removed in the next major release.

Reference PR : #7756

See JENKINS-70779.

Reference Document

Testing done

We can confirm that the changes have been made from the picture attached below.

On running yarn run lint , the deprecation warning isn't appearing anymore

Before

After

Proposed changelog entries

• Entry 1: 70779, Address Stylelint 15.x Deprecations

Desired Review

@NotMyFault

Submitter checklist

• The Jira issue, if it exists, is well-described.
• The changelog entries and upgrade guidelines are appropriate for the audience affected by the change (users or developers, depending on the change) and are in the imperative mood (see examples)

Maintainer checklist

Before the changes are marked as ready-for-merge:

• There are at least two (2) approvals for the pull request and no outstanding requests for change.
• Conversations in the pull request are over, or it is explicit that a reviewer is not blocking the change.
• Changelog entries in the pull request title and/or Proposed changelog entries are accurate, human-readable, and in the imperative mood.
• Proper changelog labels are set so that the changelog can be generated automatically.
• If the change needs additional upgrade steps from users, the upgrade-guide-needed label is set and there is a Proposed upgrade guidelines section in the pull request title (see example).
• If it would make sense to backport the change to LTS, a Jira issue must exist, be a Bug or Improvement, and be labeled as lts-candidate to be considered (see query).

[NotMyFault]

/label ready-for-merge

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This PR is now ready for merge. We will merge it after ~24 hours if there is no negative feedback.
Please see the merge process documentation for more information about the merge process.
Thanks!