dashboard: update TiDB Dashboard to v2021.10.08.1 (#4189)

[shhdgit]

Signed-off-by: Suhaha [email protected]

This is an cherry-pick of #4189

What problem does this PR solve?

Update tidb-dashboard to v2021.10.08.1

What is changed and how it works?

Check List

Tests

• Manual test (add detailed scripts or steps below)

Related changes

• Need to cherry-pick to the release branch except release-5.2, since a pr has been manually opened and there are some code changes. dashboard: update TiDB Dashboard to v2021.10.08.1 #4070

Release note

Update tidb-dashboard to v2021.10.08.1

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• disksing

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[ti-chi-bot]

@shhdgit: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

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[codecov]

Codecov Report

Merging #4183 (2facb38) into release-4.0 (605dc23) will increase coverage by 0.05%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           release-4.0    #4183      +/-   ##
===============================================
+ Coverage        74.87%   74.92%   +0.05%     
===============================================
  Files              211      211              
  Lines            20061    20061              
===============================================
+ Hits             15020    15031      +11     
+ Misses            3703     3698       -5     
+ Partials          1338     1332       -6     

Flag	Coverage Δ
unittests	74.92% <ø> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
server/member/leader.go	64.67% <0.00%> (-3.67%)	⬇️
pkg/btree/btree.go	85.30% <0.00%> (-0.97%)	⬇️
server/grpc_service.go	59.87% <0.00%> (-0.41%)	⬇️
server/cluster/cluster.go	77.14% <0.00%> (+0.25%)	⬆️
client/client.go	70.05% <0.00%> (+0.50%)	⬆️
server/tso/tso.go	80.43% <0.00%> (+1.44%)	⬆️
pkg/mock/mockhbstream/mockhbstream.go	92.59% <0.00%> (+3.70%)	⬆️
server/region_syncer/client.go	82.35% <0.00%> (+4.41%)	⬆️
pkg/dashboard/adapter/manager.go	91.48% <0.00%> (+6.38%)	⬆️
pkg/etcdutil/etcdutil.go	79.41% <0.00%> (+7.35%)	⬆️

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