Add mentionable teams to tributeValues and change team mention rules to gh's style

[a1012112796]

As title, example view:

TODO:

• Maybe need change the rule for team mention to @{{OrgName}}/{{TeamName}} to protect a team have same name with a user.
• have no idea about how to fix avatar bug now (use org's avator now)

[6543]

@a1012112796 avatar bug: use the same icon as with pullreview-requested-teams:

?

[silverwind]

use the same icon as with pullreview-requested-teams

I'd use the org avatar if possible

[lafriks]

Imho we should prefix them with org name and other possibility is to use specific group icon

[lunny]

I think maybe we should support mention anyone at first.

[lunny]

I think maybe we should support mention anyone at first.

Do you means "@ALL" ?

No. I mean currently we can only mention the orgnizaion members. We should allow to mention anyone in this Gitea instance.

[a1012112796]

I think maybe we should support mention anyone at first.

Do you means "@ALL" ?

No. I mean currently we can only mention the orgnizaion members. We should allow to mention anyone in this Gitea instance.

you can mention anyone now. but not support hint on ui now. gitea only add all assignees and participants to the list now.

[codecov-io]

Codecov Report

Merging #13198 (66ed233) into master (29d12cf) will increase coverage by 0.00%.
The diff coverage is 50.56%.

@@           Coverage Diff           @@
##           master   #13198   +/-   ##
=======================================
  Coverage   42.32%   42.33%           
=======================================
  Files         726      726           
  Lines       77689    77752   +63     
=======================================
+ Hits        32885    32915   +30     
- Misses      39406    39431   +25     
- Partials     5398     5406    +8     

Impacted Files	Coverage Δ
modules/markup/html.go	78.54% <0.00%> (-0.30%)	⬇️
modules/references/references.go	85.03% <ø> (ø)
modules/setting/repository.go	57.69% <ø> (ø)
routers/api/v1/repo/migrate.go	45.71% <0.00%> (-1.01%)	⬇️
routers/repo/migrate.go	39.56% <0.00%> (-2.74%)	⬇️
routers/repo/pull.go	31.79% <33.33%> (+<0.01%)	⬆️
routers/repo/issue.go	38.17% <40.00%> (+0.03%)	⬆️
routers/admin/users.go	27.98% <50.00%> (+0.20%)	⬆️
models/issue.go	57.14% <83.33%> (+0.23%)	⬆️
modules/context/context.go	57.29% <100.00%> (+0.23%)	⬆️
... and 7 more

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[silverwind]

I generally think those mentions need to be rewritten to use a AJAX call to obtain the mentionees. I think tribute.js already supports async loading of data. Doesn't need to be done in this PR but would be nice to have.