dr-autosync: improve state file content (#4342)

[ti-chi-bot]

This is an automated cherry-pick of #4342

Signed-off-by: disksing i@disksing.com

What problem does this PR solve?

close #4341

What is changed and how it works?

• use *time.Time instead of time.Time
• add test
• add some logs

Check List

Tests

• Unit test

Code changes

• Has persistent data change

Related changes

• Need to cherry-pick to the release branch

Release note

Improve DR_STATE file content format

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• nolouch

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[codecov]

Codecov Report

Merging #4385 (9e2e793) into release-5.2 (6717f3f) will decrease coverage by 0.09%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           release-5.2    #4385      +/-   ##
===============================================
- Coverage        74.84%   74.74%   -0.10%     
===============================================
  Files              249      249              
  Lines            25662    25672      +10     
===============================================
- Hits             19207    19189      -18     
- Misses            4770     4796      +26     
- Partials          1685     1687       +2     

Flag	Coverage Δ
unittests	74.74% <100.00%> (-0.10%)	⬇️

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

Impacted Files	Coverage Δ
server/replication/replication_mode.go	79.60% <100.00%> (+0.84%)	⬆️
server/schedulers/shuffle_hot_region.go	55.55% <0.00%> (-10.11%)	⬇️
server/region_syncer/server.go	82.96% <0.00%> (-5.93%)	⬇️
pkg/etcdutil/etcdutil.go	84.70% <0.00%> (-3.53%)	⬇️
server/schedule/operator/step.go	67.44% <0.00%> (-2.33%)	⬇️
server/schedule/operator_controller.go	83.56% <0.00%> (-1.99%)	⬇️
pkg/btree/btree.go	85.78% <0.00%> (-0.97%)	⬇️
server/core/storage.go	68.44% <0.00%> (-0.77%)	⬇️
server/cluster/cluster.go	82.24% <0.00%> (-0.48%)	⬇️
server/server.go	72.63% <0.00%> (ø)
... and 5 more

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[disksing]

/merge

[ti-chi-bot]

@disksing: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

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

Commit hash: 9e2e793

[nolouch]

/run-unit-tests