Working with new admin accounts

[hero101]

Description

Acceptance criteria

• [ ] Able to read, write, delete messages from all the rooms via the admin account
• [ ] Changing of the admin account, can still produce the results above
• [ ] Admin interface on matrix-adapter, available only via message queue, to trigger update to settings in all rooms for a given user.

Additional Context

This is a workaround until a structured approach is introduced to tackle the issue with the admin account needing too much time to sync, due to the large amount of room membership

More info on that workaround can be found at https://github.com/alkem-io/server/pull/4209 https://github.com/alkem-io/matrix-adapter/pull/43

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