chore(i18n): remove redundant ar_EG translations, keep ar

[BLumia]

The ar_EG (Egyptian Arabic) translation files are redundant variants of the existing ar (Arabic) translations. All build systems use glob patterns to collect .ts files, so removing these files has no impact on the build. The corresponding *_ar.ts files remain in place.

Files removed:

• translations/dde-session-shell_ar_EG.ts

See: DDE-333

Summary by Sourcery

Enhancements:

• Remove the redundant Egyptian Arabic translation catalog while retaining the standard Arabic translations.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Deletes the redundant ar_EG translation file so the project retains only the existing ar translations; glob-based build discovery means no build configuration changes are required.

File-Level Changes

Change	Details	Files
Remove the redundant Egyptian Arabic translation catalog while retaining the canonical Arabic catalog.	Delete the obsolete locale-specific translation file. Continue using the existing Arabic translations collected by the build glob patterns.	translations/dde-session-shell_ar_EG.ts

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BLumia, fly602

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