dm: update monitor topo with openapi

[nexustar]

What problem does this PR solve?

What is changed and how it works?

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

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[codecov-commenter]

Codecov Report

Patch coverage: 80.00% and project coverage change: +0.01% :tada:

Comparison is base (fd85680) 52.84% compared to head (c97bf28) 52.85%. Report is 155 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1859      +/-   ##
==========================================
+ Coverage   52.84%   52.85%   +0.01%     
==========================================
  Files         307      308       +1     
  Lines       35175    35256      +81     
==========================================
+ Hits        18585    18633      +48     
- Misses      14404    14430      +26     
- Partials     2186     2193       +7     

Flag	Coverage Δ
cluster	41.16% <31.03%> (-0.07%)	:arrow_down:
dm	24.74% <76.29%> (+0.17%)	:arrow_up:
playground	12.72% <0.00%> (-0.03%)	:arrow_down:
tiup	14.33% <0.00%> (-0.01%)	:arrow_down:
unittest	21.18% <0.00%> (-0.02%)	:arrow_down:

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

Files Changed	Coverage Δ
components/dm/command/scale_in.go	62.39% <ø> (ø)
pkg/utils/http_client.go	47.68% <55.00%> (+1.12%)	:arrow_up:
components/dm/command/reload.go	72.73% <80.00%> (+1.76%)	:arrow_up:
components/dm/task/update_dm_topology.go	82.14% <82.14%> (ø)
components/cluster/command/reload.go	76.32% <100.00%> (+1.32%)	:arrow_up:
components/dm/command/prune.go	54.17% <100.00%> (ø)
components/dm/command/root.go	56.50% <100.00%> (ø)
components/dm/command/scale_out.go	88.00% <100.00%> (+1.04%)	:arrow_up:
components/dm/command/start.go	82.35% <100.00%> (+2.35%)	:arrow_up:
pkg/cluster/manager/reload.go	65.26% <100.00%> (-1.74%)	:arrow_down:
... and 1 more

... and 6 files with indirect coverage changes

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