[close #267] Fix restore ratelimit

[haojinming]

Signed-off-by: haojinming [email protected]

What problem does this PR solve?

Issue Number: close #267

Problem Description:

What is changed and how does it work?

Restore does not send SetDownloadSpeedLimitRequest.

Code changes

• Has exported function/method change

Check List for Tests

This PR has been tested by at least one of the following methods:

• Unit test
• Manual test (add detailed scripts or steps below)

Side effects

• No side effects

Related changes

• No related changes

[codecov]

Codecov Report

Merging #268 (681e667) into main (15b806d) will decrease coverage by 6.2421%.
The diff coverage is 61.7647%.

❗ Current head 681e667 differs from pull request most recent head 459b35d. Consider uploading reports for the commit 459b35d to get more accurate results

Additional details and impacted files

@@               Coverage Diff                @@
##               main       #268        +/-   ##
================================================
- Coverage   60.9780%   54.7359%   -6.2422%     
================================================
  Files           239        238         -1     
  Lines         20204      20144        -60     
================================================
- Hits          12320      11026      -1294     
- Misses         6766       8074      +1308     
+ Partials       1118       1044        -74     

Flag	Coverage Δ		*Carryforward flag
br	40.1112% <63.3333%> (-19.9833%)	⬇️
cdc	61.3834% <50.0000%> (ø)		Carriedforward from 459b35d

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
cdc/cdc/processor/pipeline/sink.go	63.0434% <50.0000%> (ø)
br/pkg/restore/client.go	61.3953% <59.2592%> (+2.3044%)	⬆️
br/pkg/restore/import.go	54.0000% <100.0000%> (+2.5049%)	⬆️
br/pkg/task/restore_raw.go	64.4444% <100.0000%> (ø)
br/pkg/version/version.go	4.8780% <0.0000%> (-78.0488%)	⬇️
br/pkg/storage/parse.go	9.9099% <0.0000%> (-77.4775%)	⬇️
br/pkg/utils/retry.go	14.2857% <0.0000%> (-76.1905%)	⬇️
br/pkg/utils/math.go	0.0000% <0.0000%> (-72.4138%)	⬇️
br/pkg/utils/json.go	0.0000% <0.0000%> (-65.3062%)	⬇️
br/pkg/trace/tracing.go	0.0000% <0.0000%> (-62.5000%)	⬇️
... and 34 more

[zeminzhou]

LGTM~

[pingyu]

LGTM~