playground: make playground tag has higher priority than tiup

[nexustar]

What problem does this PR solve?

• on tiup: refactor help #1831 , we parser flag of tiup rootCmd manually, if user use tiup playground --tag xxx, tiup cannot Identify the flag and generate a random flag and pass it to playground.

What is changed and how it works?

• make playground tag has higher priority than tiup
• make tiup scan the whole args insted of args[0]

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• srstack

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[codecov-commenter]

Codecov Report

Merging #1869 (5815fc6) into master (378989e) will decrease coverage by 0.56%.
The diff coverage is 26.67%.

@@            Coverage Diff             @@
##           master    #1869      +/-   ##
==========================================
- Coverage   52.60%   52.04%   -0.56%     
==========================================
  Files         306      306              
  Lines       35036    35036              
==========================================
- Hits        18430    18233     -197     
- Misses      14441    14629     +188     
- Partials     2165     2174       +9     

Flag	Coverage Δ
cluster	40.10% <ø> (-0.82%)	⬇️
dm	24.58% <ø> (ø)
playground	12.78% <44.44%> (+<0.01%)	⬆️
tiup	14.41% <0.00%> (-0.05%)	⬇️
unittest	21.22% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/root.go	55.36% <0.00%> (-1.01%)	⬇️
components/playground/main.go	45.44% <44.44%> (+0.37%)	⬆️
pkg/cluster/api/pdapi.go	46.57% <0.00%> (-14.06%)	⬇️
pkg/cluster/task/update_meta.go	76.34% <0.00%> (-8.60%)	⬇️
pkg/cluster/spec/cdc.go	68.42% <0.00%> (-8.42%)	⬇️
pkg/cluster/task/task.go	64.81% <0.00%> (-8.33%)	⬇️
pkg/tui/cliutil.go	69.77% <0.00%> (-6.98%)	⬇️
pkg/cluster/task/update_topology.go	61.73% <0.00%> (-6.17%)	⬇️
pkg/cluster/operation/scale_in.go	50.00% <0.00%> (-5.13%)	⬇️
pkg/cluster/manager/destroy.go	51.22% <0.00%> (-4.07%)	⬇️
... and 14 more

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[nexustar]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 5815fc6

[ti-chi-bot]

@nexustar: Your PR was out of date, I have automatically updated it for you.

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