[enriched/mattermost] Improve fields

[zhquan]

This change includes useful fields:

• channel_delete_at
• channel_team_id
• file_*
• hashtags
• is_pinned
• is_reply
• message
• message_analyzed
• message_id
• parent_id
• position
• reactions_*
• roles

Remove obsolete fields:

• avatar
• is_admin
• is_owner
• is_primary_owner
• number_attachs
• profile_title
• text
• text_analyzed

Schema update accordingly.

Signed-off-by: Quan Zhou quan@bitergia.com

[coveralls]

Pull Request Test Coverage Report for Build 864274243

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 16 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.09%) to 82.381%

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Files with Coverage Reduction	New Missed Lines	%
/home/runner/work/grimoirelab-elk/grimoirelab-elk/grimoire_elk/enriched/mattermost.py	16	80.33%
<!--	Total:	16		-->

Totals
Change from base Build 864260899:	0.09%
Covered Lines:	8636
Relevant Lines:	10483

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💛 - Coveralls

[ajaragz]

Tested with a local docker Mattermost instance https://docs.mattermost.com/install/docker-local-machine.html. From a channel with multiple posts and reactions.

All fields added were found in the enriched documents. None of the removed fields are in the enriched documents.

Regarding new fields that may be interesting I don't see much else. I see that there's no email in the enriched fields but with the user_data_name and user_data_domain that's coevered.

LGTM