playground: remove resource manager

[rleungx]

What problem does this PR solve?

Resource manager microservice is never fully tested. So I'm going to remove it to avoid misleading the users.

What is changed and how it works?

Check List

Tests

• Manual test (add detailed scripts or steps below)

$ bin/tiup-playground nightly --pd.mode ms --pd 3 --scheduling 2 --tso 2 --kv 6 --tiflash 0 --host 10.2.8.101
Start pd instance:v8.0.0-alpha-nightly
Start pd instance:v8.0.0-alpha-nightly
Start pd instance:v8.0.0-alpha-nightly
Start tso instance:v8.0.0-alpha-nightly
Start tso instance:v8.0.0-alpha-nightly
Start scheduling instance:v8.0.0-alpha-nightly
Start scheduling instance:v8.0.0-alpha-nightly
Start tikv instance:v8.0.0-alpha-nightly
Start tikv instance:v8.0.0-alpha-nightly
Start tikv instance:v8.0.0-alpha-nightly
Start tikv instance:v8.0.0-alpha-nightly
Start tikv instance:v8.0.0-alpha-nightly
Start tikv instance:v8.0.0-alpha-nightly
Start tidb instance:v8.0.0-alpha-nightly
Waiting for tidb instances ready
10.2.8.101:37777 ... Done
component grafana version v8.0.0-alpha-nightly is already installed

🎉 TiDB Playground Cluster is started, enjoy!

Connect TiDB:    mysql --comments --host 10.2.8.101 --port 37777 -u root
TiDB Dashboard:  http://10.2.8.101:38999/dashboard
Grafana:         http://10.2.8.101:39125

Side effects

• Breaking backward compatibility

Release notes:

NONE

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 41.93548% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 56.03%. Comparing base (9e11d0e) to head (e6a73dd).
Report is 4 commits behind head on master.

❗ Current head e6a73dd differs from pull request most recent head 7c18c80. Consider uploading reports for the commit 7c18c80 to get more accurate results

Files	Patch %	Lines
components/playground/main.go	40.00%	9 Missing ⚠️
components/playground/playground.go	22.22%	5 Missing and 2 partials ⚠️
components/playground/instance/instance.go	0.00%	0 Missing and 1 partial ⚠️
components/playground/instance/pd.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2381      +/-   ##
==========================================
- Coverage   56.07%   56.03%   -0.03%     
==========================================
  Files         329      329              
  Lines       35040    34998      -42     
==========================================
- Hits        19646    19611      -35     
+ Misses      13056    13050       -6     
+ Partials     2338     2337       -1     

Flag	Coverage Δ
cluster	45.25% <100.00%> (-0.07%)	⬇️
dm	25.52% <100.00%> (-0.05%)	⬇️
playground	15.75% <38.71%> (-0.04%)	⬇️
tiup	33.59% <ø> (-0.05%)	⬇️
unittest	22.26% <0.00%> (+0.02%)	⬆️

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-12 09:19:57.055643897 +0000 UTC m=+763624.077890283: ☑️ agreed by srstack.

[kaaaaaaang]

/lgtm