feat(pd): rename underlying resource names

[liubog2008]

Change {cluster}-{group} to {group}-{component} as the "name space" of underlying native resources.

This change fixes two conflicts.

cluster1="aaa-xxx"
group1="bbb"

cluster2="aaa"
group2="xxx-bbb"

and

tidbgroup="bbb"
tikvgroup="bbb"

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: csuzhangxc

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 2.47350% with 276 lines in your changes missing coverage. Please review.

Project coverage is 19.69%. Comparing base (83f5ff4) to head (f519462).

Additional details and impacted files

@@            Coverage Diff             @@
##               v2    #5983      +/-   ##
==========================================
- Coverage   20.00%   19.69%   -0.32%     
==========================================
  Files         151      151              
  Lines       10305    10461     +156     
==========================================
- Hits         2062     2060       -2     
- Misses       8031     8189     +158     
  Partials      212      212              

Flag	Coverage Δ
unittest	19.69% <2.47%> (-0.32%)	⬇️