PROD-793 Fix/2540 Group messages notification conflict with media uploading components

[bb-yudhisthir]

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Changes proposed in this Pull Request:

Fixes #2540.

How to test the changes in this Pull Request:

1. Deactivate the media uploading component.
2. Go to any group and sent messages to the group.
3. Switch back to any member and check the notification.

Proof Screenshots or Video

http://somup.com/crQjfUrOLn http://image.prntscr.com/image/tDYZyLb-SZW96_Mv7LtVfA.png

final: http://somup.com/crQj1frO9M

Other information:

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [x] Have you written new tests for your changes, as applicable?
• [x] Have you successfully run tests with your changes locally?

Changelog entry

Moved & renamed hook function to "bb_messages_save_group_data()" from the Media component folder - bp-media-filters.php file to Message component folder - bp-messages-filters.php file and deprecated the old "bp_media_messages_save_group_data()" in bp-media-filters.php file

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