fix(collector): auth validator is nil

[iutx]

What this PR does / why we need it:

fix auth validator is nil

Which issue(s) this PR fixes:

• Fixes #your-issue_number
• Erda Cloud Issue Link

Specified Reviewers:

/assign @chengjoey @sfwn

ChangeLog

Language	Changelog
🇺🇸 English	fix auth validator is nil
🇨🇳 中文	修复 collector validator 空指针

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Add comment like /cherry-pick release/1.0 when this PR is merged.

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[iutx]

Validator authentication.Validator `autowired:"erda.oap.collector.authentication.Validator"`

if p.Cfg.Auth.Skip {
    p.Validator = skipValidator{}
} 

[chengjoey]

/hold
erda.oap.collector.authentication.Validator will depend on erda-server(core), but collector-agent in edge cluster without erda-server, so i make it Manually

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 15.61%. Comparing base (0b70683) to head (d97d9b3).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
.../collector/plugins/receivers/collector/provider.go	0.00%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6442      +/-   ##
==========================================
- Coverage   15.62%   15.61%   -0.01%     
==========================================
  Files        3674     3674              
  Lines      311576   311582       +6     
==========================================
- Hits        48675    48668       -7     
- Misses     257450   257460      +10     
- Partials     5451     5454       +3     

Flag	Coverage Δ
by-github-actions	15.61% <0.00%> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
.../collector/plugins/receivers/collector/provider.go	46.34% <0.00%> (-7.95%)	⬇️

... and 4 files with indirect coverage changes

[iutx]

related pr: 6420

[sfwn]

/approve