Add more test case for target's spec.TargetDir

[9547]

What problem does this PR solve?

Fix problems introduced by #755, tiup update --self results to ~/.tiup/bin/tiup deleted.

and based on #816

(base) root@rabbit:tiup <master(v1.1.0-41-gdfab8de)>$ tiup update --self
download https://tiup-mirrors.pingcap.com/tiup-v1.1.2-linux-amd64.tar.gz 4.32 MiB / 4.32 MiB 100.00% 15.68 MiB p/s
Updated successfully!
(base) root@rabbit:tiup <master(v1.1.0-41-gdfab8de)>$ tiup update --self
-bash: /home/.tiup/bin/tiup: No such file or directory

What is changed and how it works?

in #755 L233-L237 were removed, revert thos lines back, and here we check the targetDir before InstallComponent inside UpdateComponents

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:

Fix `tiup update --self` results to tiup's binary file deleted

[codecov-commenter]

Codecov Report

Merging #820 into master will decrease coverage by 3.52%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #820      +/-   ##
==========================================
- Coverage   51.26%   47.73%   -3.53%     
==========================================
  Files         258      259       +1     
  Lines       18804    18833      +29     
==========================================
- Hits         9639     8990     -649     
- Misses       7649     8378     +729     
+ Partials     1516     1465      -51     

Flag	Coverage Δ
#cluster	44.72% <0.00%> (+1.24%)	⬆️
#dm	25.10% <0.00%> (-0.01%)	⬇️
#integrate	47.73% <0.00%> (+0.64%)	⬆️
#playground	22.17% <0.00%> (-0.01%)	⬇️
#tiup	10.83% <0.00%> (?)
#unittest	?

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

Impacted Files	Coverage Δ
pkg/repository/v1_repository.go	50.76% <ø> (-13.78%)	⬇️
pkg/repository/v1manifest/local_manifests.go	34.33% <0.00%> (-4.46%)	⬇️
pkg/utils/semver.go	0.00% <0.00%> (-100.00%)	⬇️
components/dm/ansible/worker.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/telemetry/scrub.go	6.66% <0.00%> (-80.00%)	⬇️
pkg/telemetry/telemetry.go	0.00% <0.00%> (-66.67%)	⬇️
components/dm/ansible/import.go	0.00% <0.00%> (-61.99%)	⬇️
pkg/cluster/ansible/import.go	0.00% <0.00%> (-57.41%)	⬇️
pkg/cluster/executor/local.go	0.00% <0.00%> (-56.34%)	⬇️
pkg/repository/v1manifest/keys.go	3.27% <0.00%> (-55.74%)	⬇️
... and 63 more

---

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[lonng]

LGTM

[lonng]

/merge

[ti-srebot]

Your auto merge job has been accepted, waiting for:

• 811

[ti-srebot]

/run-all-tests

[ti-srebot]

@9547 merge failed.