chore(deps): remove dup stylelint depdendencies in webapp/channels

[tnir]

Summary

In webapp/channels, stylelint deps are both in dependencies and in devDependencies, but it should be only in devDependencies.

This changeset follows up the following PRs:

• #26387
• #26296

and reverts

• #26427
  • automatically generated by @unified-ci-app[bot]
  • cf. #26431 (ported to 9.7 branch)

Ticket Link

n/a

Screenshots

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Release Note

NONE

[mm-cloud-bot]

@tnir: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[mattermost-build]

Hello @tnir,

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[tnir]

/release-note-none

[tnir]

@hmhealey Thanks. Could you check it out https://github.com/mattermost/enterprise/actions/runs/9846765893, which looks like a blocker for merging, as I cannot see it.

[M-ZubairAhmed]

/update-branch