Add UT for deploy.go

[realnumber666]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Promote UT coverage
Which issue(s) this PR fixes:
Part of #3327

Special notes for your reviewer:
Still work in process, please ignore it.

Does this PR introduce a user-facing change?:
NONE

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov-commenter]

Codecov Report

Merging #3332 (b7f4f8c) into master (1d030d4) will increase coverage by 0.12%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #3332      +/-   ##
==========================================
+ Coverage   51.32%   51.45%   +0.12%     
==========================================
  Files         209      209              
  Lines       18757    18757              
==========================================
+ Hits         9627     9651      +24     
+ Misses       8632     8589      -43     
- Partials      498      517      +19     

Flag	Coverage Δ
unittests	51.45% <ø> (+0.12%)	⬆️

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see 1 file with indirect coverage changes

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[XiShanYongYe-Chang]

/reopen

[karmada-bot]

@XiShanYongYe-Chang: Failed to re-open PR: state cannot be changed. There is already an open pull request from realnumber666:add-unit-test to karmada-io:master.

In response to this:

/reopen

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