Add deploy target name to the resource state

[ffjlabo]

What this PR does:

Added deploy_target to show the livestate grouped by it on the Web UI.

Why we need it:

In the multicluster support, we introduce multi-targets in one app.

Which issue(s) this PR fixes:

Part of #5363, #5006

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.14%. Comparing base (792015b) to head (15a0e25).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5453      +/-   ##
==========================================
- Coverage   26.15%   26.14%   -0.02%     
==========================================
  Files         456      456              
  Lines       48992    48992              
==========================================
- Hits        12814    12808       -6     
- Misses      35156    35162       +6     
  Partials     1022     1022              

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[t-kikuc]

LTGM

It's simpler to use deploy_target than the root node for GENERIC UI.

[Warashi]

LGTM