playground: Fix "--tag" argument for subcommands.

[pingyu]

Issue Number: #1997

Signed-off-by: pingyu yuping@pingcap.com

What problem does this PR solve?

Close #1997 .

What is changed and how it works?

Use rootCmd.PersistentFlags() to add the "--tag" argument, other than rootCmd.Flags(), which is invisible to subcommands. Refer to https://github.com/spf13/cobra/blob/main/user_guide.md#persistent-flags.

Check List

Tests

• Manual test (add detailed scripts or steps below)

bin/tiup-playground display --tag clst21-up
Pid     Role      Uptime
---     ----      ------
743313  pd        125h42m51.503041111s
743345  tikv      125h42m51.372436142s
743346  tikv-cdc  125h42m51.363139055s

Code changes

• No.

Side effects

• No.

Related changes

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

Release notes:

Fix "--tag" argument for playground subcommands.

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

Merging #1998 (56fc0f1) into master (e8fe110) will decrease coverage by 2.25%.
The diff coverage is n/a.

❗ Current head 56fc0f1 differs from pull request most recent head b2c523f. Consider uploading reports for the commit b2c523f to get more accurate results

@@            Coverage Diff             @@
##           master    #1998      +/-   ##
==========================================
- Coverage   44.93%   42.68%   -2.25%     
==========================================
  Files         308      272      -36     
  Lines       35887    31565    -4322     
==========================================
- Hits        16123    13472    -2651     
+ Misses      17828    16421    -1407     
+ Partials     1936     1672     -264     

Flag	Coverage Δ
cluster	40.61% <ø> (+11.68%)	⬆️
dm	24.11% <ø> (ø)
playground	?
tiup	?
unittest	?

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

Impacted Files	Coverage Δ
pkg/utils/regexp.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/repository/store/store.go	0.00% <0.00%> (-100.00%)	⬇️
components/dm/ansible/worker.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/repository/store/local.go	0.00% <0.00%> (-81.48%)	⬇️
pkg/telemetry/telemetry.go	0.00% <0.00%> (-81.25%)	⬇️
pkg/repository/utils/hash.go	0.00% <0.00%> (-81.25%)	⬇️
pkg/repository/model/publish.go	0.00% <0.00%> (-80.00%)	⬇️
pkg/utils/freeport.go	0.00% <0.00%> (-77.42%)	⬇️
pkg/repository/progress.go	23.08% <0.00%> (-76.92%)	⬇️
pkg/meta/err.go	0.00% <0.00%> (-76.19%)	⬇️
... and 163 more

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[nexustar]

/merge

[ti-chi-bot]

@nexustar: /merge in this pull request requires 1 approval(s).

In response to this:

/merge

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[nexustar]

/merge

[ti-chi-bot]

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

Commit hash: b2c523f