[FIX] Dealing well with pre-configured tags in Omnichannel

[reinaldonetof]

Proposed changes

Users should be able to select tags and save room.

Depends on #3294

Issue(s)

The UI/UX of Omnichannel tags is not good. The App must be compatible with either pre-configured tags or allow agents to set the tags they want, but currently, it seems agents just can't use it properly.

How to test or reproduce

1 - Activate Omnicahnnel -> https://docs.rocket.chat/guides/omnichannel-guides/omnichannel-admins-guide
2 - Go to Omnichannel Tags (Enterprise Edition)
3 - Create one or more Tags -> https://docs.rocket.chat/guides/omnichannel-guides/omnichannel-manger-guides/tags
4 - Start a new chat through Livechat
5 - Take the Chat in the queue
6 - Go to Room Information
7 - Edit Room

In addition, this PR introduced a new rule that Omnichannel's PM noticed, that is: depending on the permission that the agent has, he can edit the user fields only when he has the permission edit-omnichannel-contact and to edit the rooms field only when has the permission edit-livechat-room-customfields. So, if the agent has both permissions, he could edit all the inputs, but If he doesn't have any permission, some inputs will be disabled.

Screenshots

Before

After

Untitled.mov

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments

[gerzonc]

LGTM